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As filed with the Securities and Exchange Commission on October 6, 2010

Registration No. 333-            

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

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FORM S-4
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933

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LANTHEUS MEDICAL IMAGING, INC.
(Exact Name of Registrant as Specified in Its Charter)

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331 Treble Cove Road
North Billerica, MA 01862
(978) 671-8001
(Name, address, including zip code, and telephone number,
including area code, of registrant's principal executive offices)

Michael P. Duffy
Vice President, General Counsel and Secretary
331 Treble Cove Road, Building 600-2
North Billerica, MA 01862
(978) 671-8408
(Name, address, including zip code, and telephone number,
including area code, of agent for service)

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See Table of Additional Registrants Below

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Copies to:

Todd R. Chandler, Esq.
Heather L. Emmel, Esq.
Weil, Gotshal & Manges LLP
767 Fifth Avenue
New York, New York 10153
(212) 310-8000

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Approximate date of commencement of proposed sale of the securities to the public:
As soon as practicable after the effective date of this Registration Statement.

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           If the securities being registered on this form are being offered in connection with the formation of a holding company and there is compliance with General Instruction G, check the following box. o

           If this form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. o

           If this form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. o

           Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of "large accelerated filer", "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act.

           If applicable, place an X in the box to designate the appropriate rule provision relied upon in conducting this transaction:

Exchange Act Rule 13e-4(i) (Cross-Border Issuer Tender Offer) o

Exchange Act Rule 14d-1(d) (Cross-Border Third-Party Tender Offer) o

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CALCULATION OF REGISTRATION FEE CHART

           The Registrants hereby amend this Registration Statement on such date or dates as may be necessary to delay its effective date until the Registrants shall file a further amendment which specifically states that this Registration Statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933 or until the Registration Statement shall become effective on such date as the Commission, acting pursuant to said Section 8(a), may determine.

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Table of Additional Registrants

        The name, address, including zip code, and telephone number, including area code, of the agent for service for each of the Additional Registrants is:

Michael P. Duffy
Vice President, General Counsel and Secretary
Lantheus Medical Imaging, Inc.
331 Treble Cove Road, Building 600-2
North Billerica, MA 01862
(978) 671-8408

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The information in this prospectus is not complete and may be changed. We may not sell these securities until the registration statement filed with the Securities and Exchange Commission is effective. This prospectus is not an offer to sell these securities and it is not soliciting an offer to buy these securities in any state where the offer or sale is not permitted.

SUBJECT TO COMPLETION, DATED OCTOBER 6, 2010

PRELIMINARY PROSPECTUS

LANTHEUS MEDICAL IMAGING, INC.

OFFER TO EXCHANGE
All Outstanding
9.750% Senior Notes due 2017 (the "Restricted Notes")
for
9.750% Senior Notes due 2017

the issuance of each of which has been registered under the Securities Act of 1933 (the "Exchange Notes" and, collectively with the Restricted Notes, the "notes"). We refer herein to the foregoing offer to exchange as the "exchange offer."

         The exchange offer will expire at 5:00 p.m., New York City time, on                        , 2010, unless we extend the exchange offer in our sole and absolute discretion.

Material Terms of the Exchange Offer

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The only conditions to completing the exchange offer are that the exchange offer not violate applicable law or any applicable interpretation of the staff of the Securities and Exchange Commission, which we refer to as the SEC or the Commission; no action or proceeding shall have been instituted or threatened in any court or by any governmental agency which might materially impair our ability to proceed with the exchange offer and no material adverse development shall have occurred in any existing action or proceeding with respect to us; and all governmental approvals shall have been obtained, which approvals we deem necessary for the consummation of the exchange offer.



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We will exchange all outstanding Restricted Notes that are validly tendered and not withdrawn prior to the expiration or termination of the exchange offer for an equal principal amount of Exchange Notes.



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You may withdraw tenders of Restricted Notes at any time prior to the expiration or termination of the exchange offer.



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Restricted Notes may be tendered only in minimum denominations of $2,000 and any integral multiple of $1,000 in excess thereof.



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The terms of the Exchange Notes are substantially identical in all material respects to those of the Restricted Notes, except that transfer restrictions, registration rights and additional interest provisions relating to the Restricted Notes do not apply to the Exchange Notes.



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We will not receive any proceeds from the exchange offer.

Results of the Exchange Offer

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The Exchange Notes may be sold in the over-the-counter market, in negotiated transactions or through a combination of such methods. We do not plan to list the Exchange Notes or Restricted Notes on a national market.



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All outstanding Restricted Notes not tendered will continue to be subject to the restrictions on transfer set forth in the outstanding Restricted Notes and the related indenture. In general, outstanding Restricted Notes may not be offered or sold, unless registered under the Securities Act of 1933, as amended (the "Securities Act"), except pursuant to an exemption from, or in a transaction not subject to, the Securities Act and applicable state securities laws.



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Other than in connection with the exchange offer, we do not plan to register the outstanding Restricted Notes under the Securities Act.

         Each broker-dealer that receives Exchange Notes for its own account pursuant to the exchange offer must acknowledge that it will deliver a prospectus in connection with any resale of the Exchange Notes. The letter of transmittal states that by so acknowledging and by delivering a prospectus, a broker-dealer will not be deemed to admit that it is an "underwriter" within the meaning of the Securities Act. This prospectus, as it may be amended or supplemented from time to time, may be used by a broker-dealer in connection with resales of Exchange Notes received in exchange for Restricted Notes where such Restricted Notes were acquired by such broker-dealer as a result of market-making activities or other trading activities. We have agreed that, for a period of up to 180 days after the expiration date of the exchange offer, we will make this prospectus available to any broker-dealer for use in connection with any such resale. See "Plan of Distribution" on page 190.

Consider carefully the "Risk Factors" beginning on page 15 of this prospectus.

         Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The date of this prospectus is                        , 2010

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        This prospectus incorporates by reference important business and financial information about us that is not included in or delivered with this prospectus. This information is available without charge to you upon written or oral request. If you would like a copy of any of this information, please submit your request to Lantheus Medical Imaging, Inc., 331 Treble Cove Rd., Building 600-2, N. Billerica, Massachusetts 01862, Attention: General Counsel, (978) 671-8408. In order to ensure timely delivery of such documents, you must request this information no later than five business days before the date you must make your investment decision. Accordingly, you should make any request for documents by                , 2010 to ensure timely delivery of documents prior to the expiration date.

        No person has been authorized to give any information or to make any representations other than those contained in this prospectus and, if given or made, such information and representations must not be relied upon as having been authorized. This prospectus does not constitute an offer to sell or the solicitation of an offer to buy any securities other than the securities to which it relates or any offer to sell or the solicitation of an offer to buy such securities in any circumstances in which such offer or solicitation is unlawful. Neither the delivery of this prospectus nor any sale made hereunder shall, under any circumstances, create any implication that there has been no change in our affairs since the date hereof or that the information contained herein is correct as of any time subsequent to its date.

TRADEMARKS

        We own or have the rights to various trademarks, service marks and trade names, including, among others, the following: DEFINITY®, Ablavar®, TechneLite®, Cardiolite®, Neurolite®, Vialmix® and Lantheus Medical Imaging® referred to in this prospectus. Solely for convenience, we refer to trademarks, service marks and trade names in this prospectus without the ^TM, ^SM and ® symbols. Such references are not intended to indicate, in any way, that we will not assert, to the fullest extent permitted under applicable law, our rights to our trademarks, service marks and trade names. Each trademark, trade name or service mark of any other company appearing in this prospectus, such as Myoview®, Vasovist® and Optison® are, to our knowledge, owned by such other company.

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SUMMARY

        This summary highlights information appearing elsewhere in this prospectus. This summary is not complete and does not contain all of the information that may be important to you. You should carefully read the entire prospectus, including the section entitled "Risk Factors," and the financial statements and related notes before deciding to participate in the exchange offer. Unless the context requires otherwise, references to "Lantheus," "our company," "we," "us" and "our" refer to Lantheus Medical Imaging, Inc. and its direct and indirect subsidiaries, references to "Lantheus Intermediate" refer to Lantheus MI Intermediate, Inc., and references to "Holdings" refer to Lantheus MI Holdings, Inc.

Overview

        We are a leading specialty pharmaceutical company that develops, manufactures and distributes innovative diagnostic medical imaging products on a global basis. Our current imaging agents primarily assist in the diagnosis of heart, vascular and other diseases using nuclear imaging, echocardiography and magnetic resonance imaging ("MRI") technologies. We also have a full clinical and preclinical development pipeline of next-generation and first-in-class products that use Positron Emission Tomography ("PET") and MRI technologies. We believe that our products offer significant benefits to patients, healthcare providers and the overall healthcare system. As a result of more accurate diagnosis of disease, we believe our products allow healthcare providers to make more informed patient care decisions, potentially improving outcomes, reducing patient risk and decreasing costs for payors and the entire healthcare system.

        With direct operations in the United States, Puerto Rico, Canada and Australia, we have a long and distinguished history of developing and commercializing innovative market-changing products. Our principal branded products include DEFINITY, Cardiolite and TechneLite, which, in the aggregate, accounted for approximately 76% of our total revenues in 2009.

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DEFINITY.  DEFINITY Vial for (Perflutren Lipid Microsphere) Injectable Suspension is the leading ultrasound contrast agent used in ultrasound exams of the heart, also known as echocardiographic exams.



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Cardiolite.  Cardiolite (Kit for Preparation of Technetium Tc99m Sestamibi for Injection) is the leading technetium-based radiopharmaceutical used in Single Photon Emission Computed Tomography ("SPECT") myocardial perfusion imaging ("MPI") procedures. Cardiolite is primarily used for detecting coronary artery disease.



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TechneLite.  TechneLite is a technetium-based generator which provides the essential medical isotope used by radiopharmacies to radiolabel Cardiolite and other Tc-99m-based radiopharmaceuticals used in nuclear medicine procedures.

        In addition to our broad portfolio of products developed internally, which are protected by patents we own in the United States and numerous foreign jurisdictions, we actively seek acquisition, in-licensing and co-promotion opportunities to further expand our portfolio and leverage our core capabilities in the diagnostic medical imaging space. We purchased from EPIX Pharmaceuticals, Inc. ("EPIX") its U.S., Canadian and Australian rights to Ablavar, a magnetic resonance angiography ("MRA") imaging agent recently approved by the U.S. Food and Drug Administration ("FDA"), in April 2009 and the balance of the worldwide rights in June 2010. Ablavar is a gadolinium-based contrast agent indicated to evaluate aortoiliac occlusive disease in adults with known or suspected peripheral vascular disease and is the first contrast agent approved for an MRA indication in the United States.

        We distribute our products in the United States and internationally through radiopharmacies, distributor relationships and our direct sales force. In addition, we both own radiopharmacies and sell directly to end-users in Australia, Canada and Puerto Rico. In the rest of the world, including Europe, Asia and Latin America, we utilize distributor relationships to distribute our products.

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        To supplement our portfolio of marketed products, we have an experienced research and development ("R&D") team with expertise across the discovery, preclinical and clinical development continuum, including Phase IV post-marketing studies.

Corporate History

        Founded in 1956 as New England Nuclear Corporation, we were purchased by E. I. du Pont de Nemours and Company in 1981. Bristol-Myers Squibb Company ("BMS") subsequently acquired the diagnostic medical imaging business as part of its acquisition of DuPont Pharmaceuticals in 2001. Avista Capital Partners, L.P. and affiliates (collectively, "Avista") acquired the medical imaging business from BMS in January 2008 (the "Acquisition").

Our Sponsor

        Avista is a leading private equity firm with offices in New York, NY, Houston, TX and London, UK. Founded in 2005 as a spin-out from the former DLJ Merchant Banking Partners ("DLJMB") franchise, Avista's strategy is to make controlling or influential minority investments primarily in growth-oriented energy, healthcare and media companies. Through its team of seasoned investment professionals and industry experts, Avista seeks to partner with exceptional management teams to invest in and add value to well-positioned businesses.

Our Executive Offices

        Our principal executive offices are located at 331 Treble Cove Road, North Billerica, Massachusetts 01862, and our telephone number at that address is (978) 671-8001. Our web site is located at www.lantheus.com. The information on our web site is not part of, and is not incorporated into, this prospectus.

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Summary of the Terms of the Exchange Offer

        On May 10, 2010, we completed the private offering of $250,000,000 aggregate principal amount of our Restricted Notes. We refer to the issuance of the Restricted Notes in this prospectus as the "original issuance."

        At the time of the original issuance, we entered into a registration rights agreement with the initial purchasers of the Restricted Notes in which we agreed to, among other things, complete an exchange offer for the Restricted Notes. You are entitled to exchange your Restricted Notes in the exchange offer for Exchange Notes (as defined below) with identical terms, except that the Exchange Notes will have been registered under the Securities Act and will not bear legends restricting their transfer. Unless you are a broker-dealer or unable to participate in the exchange offer, we believe that the Exchange Notes to be issued in the exchange offer may be resold by you without compliance with the registration and prospectus delivery requirements of the Securities Act. You should read the discussions under the headings "The Exchange Offer" and "Description of the Exchange Notes" for further information regarding the Exchange Notes.

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Summary of the Terms of the Exchange Notes

        The summary below describes the principal terms of the Exchange Notes. Some of the terms and conditions described below are subject to important limitations and exceptions. The "Description of the Exchange Notes" section of this prospectus contains a more detailed description of the terms and conditions of the Exchange Notes.

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Summary Consolidated Financial Data

        The following table sets forth (i) summary consolidated financial data for Lantheus Intermediate, our parent company and a guarantor of the notes (the "Successor"), as of and for the six months ended June 30, 2009 and 2010, which have been derived from the unaudited consolidated financial statements of Lantheus Intermediate included elsewhere in this prospectus, (ii) summary consolidated financial data for Lantheus Intermediate, our parent company and a guarantor of the notes (the Successor), for the fiscal years ended December 31, 2008 and 2009, which have been derived from the audited consolidated financial statements of Lantheus Intermediate included elsewhere in this prospectus and (iii) summary consolidated financial data for Bristol-Myers Squibb Medical Imaging, Inc. ("BMSMI") (the "Predecessor," formerly a division of BMS and now known as Lantheus Medical Imaging, Inc.) for the year ended December 31, 2007, which have been derived from the audited financial statements of BMSMI included elsewhere in this prospectus.

        The financial statements of BMSMI for the year ended December 31, 2007 were prepared in connection with Avista's acquisition of Lantheus on January 8, 2008 and contain expense allocations for corporate functions historically provided to BMSMI by BMS and not costs that we would have incurred as a stand-alone entity. These statements have been prepared using the Predecessor's bases in the assets and liabilities and the historical results of operations. As a result, the financial statements of BMSMI for the year ended December 31, 2007 are not comparable to our financial statements for subsequent periods. See "Basis of Financial Information."

        The summary consolidated financial data set forth below and elsewhere in this prospectus are not necessarily indicative of our future performance. You should read this information together with "Capitalization," "Selected Consolidated Financial Data," "Management's Discussion and Analysis of

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Financial Condition and Results of Operations" and the audited and unaudited consolidated financial statements and related notes included elsewhere in this prospectus.

 

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The following table provides a reconciliation of our total long-term debt to net debt and the net debt to Adjusted EBITDA calculation:

We have included information concerning our net debt to Adjusted EBITDA in this prospectus because we believe that such information is used by certain investors as one measure of a company's historical performance.

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RISK FACTORS

        Participation in the exchange offer and an investment in the notes involves a high degree of risk. You should carefully consider the risks described below, together with the other information contained in this prospectus, before making your decision to participate in the exchange offer or invest in the notes. Any of the following risks, as well as other risks and uncertainties, could harm the value of the notes directly, or our business and financial results and thus indirectly cause the value of the notes to decline. The risks described below are not the only ones that could impact our company or the value of the notes. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial may also materially and adversely affect our business, financial condition or results of operations. As a result of any of these risks, known or unknown, you may lose all or part of your investment in the notes.

Risks Relating to our Business and Industry

The global supply of Molybdenum-99 ("Moly") is fragile and not stable. Our dependence on a limited number of third party suppliers for Moly could prevent us from delivering our products to our customers in the required quantities, within the required timeframe, or at all, which could result in order cancellations and decreased revenues.

        A critical ingredient of TechneLite, currently our largest product by annual revenues, is Moly. There are six major reactors located around the world which produce large scale amounts of Moly: NRU located in Canada; HFR located in The Netherlands; BR2 located in Belgium; OSIRIS located in France; SAFARI located in South Africa; and OPAL located in Australia. Moly produced at these reactors is then finished at one of five processing sites: MDS Nordion in Canada; Covidien in The Netherlands; Institute for Radioelements ("IRE") in Belgium, which also processes raw Moly from several other smaller European reactors; NTP Radioisotopes (Pty) Ltd. ("NTP") in South Africa; and the Australian Nuclear Science and Technology Organisation ("ANSTO") in Australia. Finished Moly is then sold to technetium generator manufacturers, including us. Historically, our largest supplier of Moly has been MDS Nordion which has relied on the NRU reactor owned and operated by AECL, a Crown corporation of the Government of Canada, located in Chalk River, Ontario. This reactor was off-line from May 2009 until August 2010 due to a "heavy water" leak in the reactor vessel. The inability of the NRU reactor to produce Moly and MDS Nordion to finish Moly during the shutdown period had a substantial negative effect on our business, results of operations, financial condition and cash flows. Although the NRU reactor returned to service and we are receiving substantial amounts of Moly from MDS Nordion to serve our customers' needs, the NRU reactor is 53 years old and its current license expires in 2011. Although the Government of Canada previously publicly stated its intent to exit the isotope business in the longer term, AECL and the Government of Canada recently stated that they intend to apply to extend the license for the NRU reactor for an additional five years to 2016. However, we cannot assure you that the license will be extended beyond 2011. There can also be no assurance that the NRU reactor will not experience other planned or unplanned shutdowns in the future. Further prolonged planned or unplanned shutdowns would limit the amount of Moly available to us and limit the quantity of TechneLite that we could manufacture, distribute and sell, resulting in a further substantial negative effect on our business, results of operations, financial condition and cash flows.

        In the face of the NRU reactor operating challenges, the lack of a long-term commitment by the Government of Canada to the medical isotope industry and the NRU reactor re-licensure risks in 2011, we entered into Moly supply agreements with NTP and IRE to augment our supply of Moly. While this additional Moly supply allowed us to continue to manufacture and sell technetium generators during the NRU reactor shutdown, this replacement Moly production capacity was not, and for the immediate future will not be, able to replace the quantity of supply we otherwise receive from MDS Nordion. Moreover, any further disruption of service from any of our Moly suppliers could have a material adverse effect on our business, results of operations, financial condition and cash flows. We are also

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pursuing additional sources of Moly from potential new producers around the world to further augment our current supply, but we cannot assure you that these possible additional sources of Moly will result in commercial quantities of Moly for our business, or that these new suppliers together with our current suppliers will be able to deliver a sufficient quantity of Moly to meet our needs.

        U.S., Canadian and international governments have encouraged the development of a number of alternative Moly production projects with existing reactors and technologies as well as new technologies. However, the Moly produced from these projects will likely not become available until 2013, if ever.

        With the general instability in the global supply of Moly and recent supply shortages, we have faced substantial increases in the cost of Moly in comparison to historical costs. We attempt to pass these Moly cost increases on to our customers in our customer contracts. If we are not able to do so in the future, our margins may decline further with respect to our TechneLite generators, which could have a material adverse effect on our business, results of operations, financial condition and cash flows. In addition, the instability in the global supply of Moly resulted in Moly producers requiring, in exchange for fixed Moly prices, supply minimums in the form of take-or-pay obligations. If we are contractually obligated to purchase greater volumes of Moly than we can sell, these supply minimums could have a material adverse effect on our business, results of operations, financial condition and cash flows.

        The Moly supply shortage also had an incremental negative effect on the use of other technetium generator-based diagnostic medical imaging agents, including Cardiolite. With less Moly, we manufactured fewer generators for radiopharmacies and hospitals to make up unit doses of Cardiolite, resulting in decreased share of Cardiolite in favor of Thallium, an older medical isotope that does not require Moly, and other diagnostic modalities. Although we believe that with the return to service of the NRU reactor, Cardiolite sales will benefit, if the Moly supply challenges again become acute, there may be further negative effects on our business, results of operations, financial condition and cash flows.

Our dependence upon third parties for the manufacture and supply of a substantial portion of our products could prevent us from delivering our products to our customers in the required quantities, within the required timeframe, or at all, which could result in order cancellations and decreased revenues.

        We obtain a substantial portion of our products from third party suppliers. We rely on sole source manufacturing for DEFINITY at Ben Venue Laboratories, Inc. ("BVL") and Ablavar at Covidien PLC. We also rely on BVL for a majority of our Cardiolite supply and certain TechneLite accessories. In addition, for reasons of quality assurance or cost effectiveness, we purchase certain components and raw materials from sole suppliers. Because we do not control the actual production of many of the products we sell, we may be subject to delays caused by interruption in production based on conditions outside of our control. At our North Billerica, Massachusetts facility, we manufacture TechneLite on a relatively new, highly automated production line, as well as Thallium and Gallium using our older cyclotron technology. If we or one of our manufacturing partners experiences an event, including a labor dispute, natural disaster, fire, power outage, security or other issue, we may be unable to manufacture the relevant products at previous levels, if at all. Due to the stringent regulations and requirements of the governing regulatory authorities regarding the manufacture of our products, we may not be able to quickly establish additional or replacement sources for certain components or materials. In July 2010, BVL temporarily shut down the facility where they manufacture DEFINITY, Cardiolite and other products in order to upgrade the facility to meet certain European Medicines Agency ("EMEA") requirements. BVL has planned for the shutdown to run through March 2011. In anticipation, BVL manufactured additional inventory of these products to meet our expected needs during this period. There can be no assurance that BVL's facility will return to service in March 2011

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or that the inventory supplied will be sufficient to meet demand for our products during the shutdown period.

        We have initiated technology transfer activities to establish and secure a second source of supply for each of DEFINITY and Ablavar. We cannot assure you, however, that these activities will be maintained, will be successful, or that before such second source manufacturers are fully functional that we will be able to avoid or mitigate possible interim supply shortages. In addition, we cannot assure you that our existing suppliers or any new suppliers can adequately maintain either their financial health or regulatory compliance to allow continued production and supply. A reduction or interruption in manufacturing, or an inability to secure alternative sources of raw materials or components, could have a material adverse effect on our business, results of operations, financial condition and cash flows.

We are highly dependent on payments from third party healthcare payors, including government sponsored programs, particularly Medicare, in the United States and other countries in which we operate, and reductions in third party coverage and reimbursement rates for our products could adversely affect our business and results of operations.

        A substantial portion of our revenue depends, in part, on the extent to which the costs of our products are reimbursed by third party private and governmental payors, including Medicare, Medicaid and other U.S. government sponsored programs as well as other non-U.S. governmental payors and private payors. These third party payors exercise significant control over patient access and increasingly use their enhanced bargaining power to secure discounted rates and other requirements that may increase the cost of service or reduce demand for our products. Our potential customers' ability to obtain appropriate reimbursement for products and services from these third party payors affects the selection of products they purchase and the prices they are willing to pay. If these third party payors do not provide appropriate reimbursement for the costs of our products, deny their coverage or reduce their current levels of reimbursement, healthcare professionals may not prescribe our products and providers and suppliers may not purchase our products. In addition, demand for new products may be limited unless we obtain favorable reimbursement policies (including coverage, coding and payment) from governmental and private third party payors at the time of the product's introduction. Third party payors continually review their coverage policies for existing and new therapies and can deny coverage for treatments that include the use of our products or revise payment policies such that payments do not adequately cover the cost of our products. Even if third party payors make coverage and reimbursement available, such reimbursement may not be adequate or these payors' reimbursement policies may have an adverse effect on our business, results of operations, financial condition and cash flows.

        Over the past several years, Medicare has implemented numerous changes to payment policies for imaging procedures, some of which have had a negative impact on utilization of imaging services. These include limiting payments in physician offices and free-standing imaging facility settings based upon rates paid to hospital outpatient departments, reducing payments for certain imaging procedures when performed together with other imaging procedures in the same family of procedures, and making significant revisions to the methodology for determining the practice expense portion of Medicare payment, which covers physician office expenses, including staff, equipment and supplies. In 2010, the U.S. government's Centers for Medicare and Medicaid Services ("CMS"), which administers the Medicare program, began a four year transition to changes in the practice expense methodology based upon the Physician Practice Information Survey ("PPIS"), which collected information on physician practice expenses by specialty. For 2010, CMS estimated that these and other changes to Medicare payment policy would reduce payments for cardiology services by approximately 8% and for nuclear medicine services by 18%. Cardiology and nuclear medicine are the key specialties performing imaging procedures using our products. Unless Medicare changes its plans to implement the PPIS fully by 2013 or Congress mandates such changes, payments are expected to be reduced further by 2013.

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Reforms to the United States healthcare system may adversely affect our business.

        A significant portion of our patient volume is derived from U.S. government healthcare programs, principally Medicare, which are highly regulated and subject to frequent and substantial changes. For example, in March 2010, the President signed one of the most significant healthcare reform measures in decades, the Patient Protection and Affordable Care Act, as amended by the Health Care and Education Affordability Reconciliation Act (collectively, the "Healthcare Reform Act"). It contains a number of provisions, including those governing enrollment in federal healthcare programs, reimbursement changes and fraud and abuse, which will impact existing government healthcare programs and will result in the development of new programs. We cannot assure you that the Healthcare Reform Act will not adversely affect our business and financial results, and we cannot predict how future federal or state legislative or administrative changes relating to healthcare reform will affect our business.

        We expect that the Healthcare Reform Act and other healthcare reform measures that may be adopted in the future, such as the Healthcare Reform Act's imposition of a non-deductible excise tax on pharmaceutical manufacturers or importers who sell "branded prescription drugs," could have a material adverse effect on our industry generally and our ability to successfully commercialize our products or could limit or eliminate our spending on development projects.

The Healthcare Reform Act could potentially reduce the number of diagnostic medical imaging procedures performed or could reduce the amount of reimbursements paid for such procedures.

        The Healthcare Reform Act is expected to extend coverage to approximately 32 million previously uninsured Americans. However, we cannot predict how many, if any, of those additional insureds would be current or future candidates for diagnostic medical imaging or, if as a result of such larger pool of insured Americans, the aggregate number of diagnostic medical imaging procedures performed in the United States would increase.

        Further, the implementation of the Healthcare Reform Act could potentially reduce the aggregate number of diagnostic medical imaging procedures performed in the United States. Under the Healthcare Reform Act, referring physicians under the federal self-referral law must inform patients that they may obtain certain diagnostic imaging services from a provider other than that physician, his or her group practice, or another physician in his or her group practice. The referring physician must provide each patient with a written list of other suppliers who furnish such services in the area in which the patient resides. This new information provision could have the effect of shifting where certain diagnostic medical imaging procedures are performed, which could potentially reduce the overall number of diagnostic medical imaging procedures performed.

        For 2010, CMS reduced the per procedure medical imaging reimbursement in the physician office and free-standing imaging facility. CMS intends to transition further reductions in payments through 2013. This could result in physicians or group practices ceasing to provide these services and have the further effect of shifting where certain medical imaging procedures are performed from the physician office and free-standing imaging facility setting to the hospital outpatient setting, which could potentially reduce the overall number of diagnostic medical imaging procedures performed. Further, this could slow the acceptance and introduction of next-generation imaging equipment into the marketplace, which, in turn, could adversely impact the future market adoption of certain of our imaging agents already in the market or currently in clinical or preclinical development. We expect that there will continue to be proposals to reduce or limit Medicare and Medicaid payment for services. To the extent any of these or other provisions of the Healthcare Reform Act have the effect of reducing the aggregate number of diagnostic medical imaging procedures performed in the United States, our business, results of operations, financial condition and cash flows would be adversely affected. See "Business—Regulatory Matters."

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        Further, we expect that there will continue to be proposals to reduce or limit Medicare and Medicaid payment for services. Rates paid by private third party payors, including those that provide Medicare supplemental insurance, are based, in part, on established physician, clinic and hospital charges and are generally higher than Medicare payment rates. Reductions in the amount of reimbursement paid for diagnostic medical imaging procedures and changes in the mix of our patients between non-governmental payors and government sponsored healthcare programs and among different types of non-government payor sources, could have a material adverse effect on our business, results of operations, financial condition and cash flows.

Our business and industry are subject to complex and costly regulations. If government regulations are interpreted or enforced in a manner adverse to us or our business, we may be subject to enforcement actions, penalties, exclusion and other material limitations on our operations.

        Both before and after the approval of our products and product candidates, we, our products, product candidates, operations, facilities, suppliers, distributors, contract manufacturers, contract research organizations and contract testing laboratories are subject to extensive regulation by federal, state and local government agencies in the United States as well as non-U.S. and transnational laws and regulations, with regulations differing from country to country. In the United States, the FDA regulates, among other things, the pre-clinical testing, clinical trials, manufacturing, safety, efficacy, potency, labeling, storage, record keeping, quality systems, advertising, promotion, sale, distribution, and import and export of drug products. We are required to register our business for permits and/or licenses with, and comply with the stringent requirements of the FDA, the U.S. Drug Enforcement Agency ("DEA"), the U.S. Nuclear Regulatory Commission (the "NRC"), the U.S. Department of Health and Human Services ("HHS"), Health Canada, the EMEA, state and provincial boards of pharmacy, state and provincial health departments and other state and provincial agencies.

        For example, we are required to report certain adverse events and production problems, if any, to the FDA, and to comply with requirements concerning advertising and promotion for our products. Also, quality control and manufacturing procedures at our own facility and at third party suppliers must conform to current Good Manufacturing Practices ("cGMP") regulations after approval, and the FDA periodically inspects manufacturing facilities to assess compliance with cGMPs. Accordingly, we and others with whom we work must expend time, money, and effort in all areas of regulatory compliance, including manufacturing, production, and quality control.

        In addition, we are subject to laws and regulations that govern financial and other arrangements among healthcare providers, including federal and state anti-kickback statutes, federal and state false claims laws and regulations, beneficiary inducement laws and regulations, and other fraud and abuse laws and regulations.

        For example, we are currently in the process of entering into a Medicaid Drug Rebate Agreement, which could subject us to potential liability under the False Claims Act. Although we and most of our competitors have not previously entered into such an agreement and it is unclear that it is required, we have received inquiries from several states and have decided to enter into such agreement at this time. Determination of the rebate amount for our products under the Medicaid program, as well as determination of payment amounts under Medicare and certain other third party payers, including government payers, depends upon information reported by us to the government. If we provide customers or government officials with inaccurate information about the products' eligibility for reimbursement, or the products fail to satisfy eligibility requirements, we could be subject to potential liability under the False Claims Act or other laws and regulations.

        Additionally, funds received under all healthcare reimbursement programs are subject to audit with respect to the proper billing. Our customers engage in billing and as such, retroactive adjustments of revenue from these programs could occur.

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        Failure to comply with other requirements and restrictions placed upon us by laws and regulations can result in fines, civil and criminal penalties, program exclusion and debarment. Possible consequences of such actions could include:

•

substantial modifications to our business practices and operations; a total or partial shutdown of production in one or more of our facilities while we remediate the alleged violation;



•

delays in or the inability to obtain future pre-market clearances or approvals; and



•

withdrawals or suspensions of current products from the market.

        Regulations are subject to change as a result of legislative, administrative or judicial action, which may also increase our costs or reduce sales. Violation of any of these regulatory schemes, individually or collectively, could disrupt our business and have a material adverse affect on our business, results of operations, financial condition and cash flows.

It is time consuming and costly to obtain regulatory approval for our product candidates, which could delay or prevent us from being able to generate revenue from product sales.

        We are not permitted to market our product candidates in the United States or other countries until we have received requisite regulatory approvals. For example, securing FDA approval requires the submission of a new drug application ("NDA") to the FDA for our drug candidates. The NDA must include extensive nonclinical and clinical data and supporting information to establish the product candidate's safety and effectiveness for each indication. The NDA must also include significant information regarding the chemistry, manufacturing and controls for the product. The FDA review process can take many years to complete, and approval is never guaranteed. If a product is approved, the FDA may limit the indications for which the product may be marketed, require extensive warnings on the product labeling, impose restricted distribution programs, require expedited reporting of certain adverse events, or require costly ongoing requirements for post-marketing clinical studies and surveillance or other risk management measures to monitor the safety or efficacy of the product candidate. Markets outside of the United States also have requirements for approval of drug candidates with which we must comply prior to marketing. Obtaining regulatory approval for marketing of a product candidate in one country does not ensure we will be able to obtain regulatory approval in other countries, but a failure or delay in obtaining regulatory approval in one country may have a negative effect on the regulatory process in other countries. Also, any regulatory approval of any of our products or product candidates, once obtained, may be withdrawn. Approvals might not be granted on a timely basis, if at all.

        Any failure or significant delay in completing clinical trials for our product candidates, or in receiving regulatory approval for the sale of our product candidates, may severely harm our business and delay or prevent us from being able to generate revenue from product sales. See "—Our business and industry are subject to complex and costly regulations. If government regulations are interpreted or enforced in a manner adverse to us or our business, we may be subject to enforcement actions, penalties and other material limitations on our operations."

Challenges with product quality or product performance, including defects, caused by us or our suppliers could result in a decrease in customers and sales, unexpected expenses and loss of market share.

        The manufacture of our products is highly exacting and complex and must meet stringent quality requirements, due in part to strict regulatory requirements, including the FDA's cGMPs. Problems may arise during manufacturing for a variety of reasons including equipment malfunction, failure to follow specific protocols and procedures, defective raw materials and environmental factors. Additionally, manufacturing flaws, component failures, design defects, off-label uses or inadequate disclosure of product-related information could result in an unsafe condition or the injury or death of a patient.

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Such events could lead to a recall of, or issuance of a safety alert relating to, our products. We also may undertake voluntarily to recall products or temporarily shut down production lines based on internal safety and quality monitoring and testing data.

        These problems could cause us to incur significant costs, including costs to replace products, lost revenue, damage to customer relationships, time and expense spent investigating the cause, and potentially cause similar losses with respect to other products. Such problems could also divert the attention of our management research and development personnel from product development efforts. If we deliver products with defects, or if there is a perception that our products contain errors or defects, we could incur recall and product liability costs, and our credibility and the market acceptance and sales of our products could materially decline. Due to the strong name recognition of our brands, an adverse event involving one of our products could result in reduced market acceptance and demand for all products within that brand, and could harm our reputation and our ability to market our products in the future. In some circumstances, adverse events arising from or associated with the design, manufacture or marketing of our products could result in the suspension or delay of regulatory reviews of our applications for new product approvals. Such problems could have a material adverse effect on our business, results of operations, financial condition and cash flows.

Our marketing and sales practices may contain risks that could result in significant liability, require us to change our business practices and restrict our operations in the future.

        We are subject to federal, state and local laws targeting fraud and abuse in the healthcare industry, including the federal fraud and abuse law (the "Federal Anti-Kickback Statute"), the False Claims Act, the Foreign Corrupt Practices Act, the self-referral laws and restrictions on the promotion of off-label uses of our products. Violations of these laws are punishable by criminal or civil sanctions, including substantial fines, imprisonment and exclusion from participation in healthcare programs such as Medicare and Medicaid as well as health programs outside the United States. These laws and regulations are complex and subject to changing interpretation and application, which could restrict our sales or marketing practices. Even minor, inadvertent irregularities in claim submissions could potentially give rise to a charge that the law has been violated. Although we believe we maintain an appropriate compliance program, it may not be adequate in the detection or prevention of violations and/or the relevant regulatory authorities may disagree. Additionally, if there is a change in law, regulation or administrative or judicial interpretations, we may have to change one or more of our business practices to be in compliance with these laws. Required changes could be costly and time consuming. The recently enacted Healthcare Reform Act imposes new reporting and disclosure requirements on device and drug manufacturers for any "transfer of value" made or distributed to prescribers and other healthcare providers, effective March 30, 2013. Such information will be made publicly available in a searchable format beginning September 30, 2013. In addition, device and drug manufacturers will also be required to report and disclose any investment interests held by physicians and their immediate family members during the preceding calendar year. Failure to submit required information may result in civil monetary penalties of up to $150,000 per year (and up to $1 million per year for "knowing failures"), for all payments, transfers of value or ownership or investment interests not reported in an annual submission. Finally, under the Healthcare Reform Act, effective April 1, 2012, pharmaceutical manufacturers and distributors must provide the HHS with an annual report on the drug samples they provide to physicians.

        The Healthcare Reform Act also provides greater financial resources to be allocated to enforcement of these laws and regulations and lower proof-standards for the Federal Anti-Kickback Statute and criminal healthcare fraud statutes, which may increase overall compliance costs for industry participants, including us. A person or entity no longer needs to have actual knowledge of this statute or specific intent to violate it. In addition, the Healthcare Reform Act provides that the government may assert that a claim including items or services resulting from a violation of the Federal

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Anti-Kickback Statute constitutes a false or fraudulent claim for purposes of the false claims statutes. The violation of these laws, or our exclusion from such programs as Medicare, Medicaid and other governmental programs, a result of a violation of such laws, could have a material adverse effect on our business, results of operations, financial condition and cash flows.

Ultrasound contrast agents may cause side effects which could limit our ability to sell DEFINITY.

        DEFINITY is an ultrasound contrast agent based on perflutren lipid microspheres. In 2007, the FDA received reports of deaths and serious cardiopulmonary reactions following the administration of ultrasound micro-bubble contrast agents used in echocardiography. Four of the 11 reported deaths were caused by cardiac arrest occurring either during infusion or within 30 minutes following the administration of the contrast agent; most of the serious but non-fatal reactions also occurred in this time frame. As a result, in October 2007, the FDA requested that we and GE Healthcare, which distributes Optison, a competitor to DEFINITY, add a boxed warning to these products emphasizing the risk for serious cardiopulmonary reactions and that the use of these products was contraindicated in certain patients. In a strong reaction by the cardiology community to the FDA's new position, a letter was sent to the FDA, signed by 161 doctors, stating that the benefit of these ultrasound contrast agents outweighed the risks and urging that the boxed warning be removed. In May 2008, the FDA substantially modified the boxed warning, which, however, is still in place. Further, the discovery of additional safety issues may result in further changes in labeling or result in restrictions on the approval of our product, including removal of the product from the market. Lingering safety concerns about DEFINITY among some healthcare providers or future unanticipated side effects or safety concerns associated with DEFINITY could have a material adverse effect on the unit sales of this product and our financial condition and results of operations.

Gadolinium-based imaging agents may cause side effects which could limit our ability to sell Ablavar.

        Ablavar is a contrast agent that contains gadolinium. Gadolinium contrast agents have been associated with the development of a very rare skin disease, nephrogenic systemic fibrosis ("NSF"). It has also been reported that NSF may affect the internal anatomy as well as the skin. In May 2007, the FDA requested that manufacturers of all gadolinium-containing contrast agents add a boxed warning and a new warning section that describes the risk of NSF because it is currently impossible to definitively determine whether the extent of risks for developing NSF are the same for all gadolinium-containing agents. In September 2010, the FDA requested that additional safety-related label changes be implemented for all gadolinium-based contrast agents to highlight the risks of NSF. Of the seven gadolinium-based contrast agents currently approved for use in the United States, three of them were required by the FDA to include certain new contraindications relating to severe kidney disease. The FDA required no substantial changes to the Ablavar prescribing information. We are aware of ongoing litigation in the United States relating to the use of imaging agents containing gadolinium. When it was purchased by us from EPIX in April 2009, Ablavar was known as Vasovist. To date, there have been no reported cases of NSF in connection with the administration of Ablavar or, to our knowledge, Vasovist, and neither we nor EPIX have been named as a party or joined in any litigation relating to NSF. We believe that over 90,000 doses of Ablavar and Vasovist have been sold to date. However, in the event Ablavar is directly linked to this very rare disease or other unanticipated side effects, such safety concerns could have a material adverse effect on the sales of this product, and our financial conditions and results of operations.

Our business depends on our ability to introduce new products and adapt to a changing technology and diagnostic landscape.

        The healthcare industry is characterized by continuous technological development resulting in changing customer preferences and requirements. The success of new product development depends on

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many factors, including our ability to anticipate and satisfy customer needs, obtain regulatory and reimbursement approvals on a timely basis, develop and manufacture products in a cost-effective and timely manner, maintain advantageous positions with respect to intellectual property and differentiate our products from our competitors. To compete successfully in the marketplace, we must make substantial investments in new product development whether internally or externally through licensing or acquisitions. Our failure to introduce new and innovative products in a timely manner would have an adverse effect on our business, results of operations, financial condition and cash flows.

        Even if we are able to develop, manufacture and obtain regulatory and reimbursement approvals for our new products, the success of these products would depend upon market acceptance. Levels of market acceptance for our new products could be affected by a number of factors, including:

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the availability of alternative products from our competitors, including, in the case of Ablavar, being one of seven gadolinium-based contrast agents currently approved for use in the United States;



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the price of our products relative to those of our competitors;



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the timing our market entry;



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our ability to market and distribute our products effectively, including, in the case of our PET Perfusion Agent ("PPA"), the creation of a complex field-based manufacturing and distribution network involving PET cyclotrons located at radiopharmacies where the agent will be manufactured and distributed rapidly to end-users, given the agent's 110-minute half-life; and



•

market acceptance of our products, including, in the case of DEFINITY, appropriate resources to administer an intravenous agent during an echocardiography procedure, and in the case of PPA, sufficient market penetration of PET cameras to which nuclear cardiologists have reasonable access.

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        The field of diagnostic medical imaging is dynamic, with new products, including equipment and agents, continually being developed and existing products continually being refined. Our own diagnostic imaging agents compete not only with other similarly administered imaging agents but also with imaging agents employed in different and often competing diagnostic modalities. New imaging agents in a given diagnostic modality may be developed that provide benefits superior to the then-dominant agent in that modality, resulting in commercial displacement. Similarly, changing perceptions about comparative efficacy and safety including, among other things, comparative radiation exposure, as well as changing availability of supply may favor one agent over another or one modality over another. For example, prior to the recent outage of the NRU reactor, we experienced a slow annual decline in demand for Thallium as a myocardial perfusion imaging agent, in favor of Cardiolite which has superior safety and efficacy characteristics. To the extent there is technological obsolescence in any of our products that we manufacture, resulting in lower unit sales or decreased unit sales prices, we will have increased unit overhead allocable to the remaining share, which could have a material adverse effect on our business, results of operations, financial condition and cash flows. In addition, in the case of a new product such as Ablavar, if we do not ultimately meet our sales expectations for that product or we cannot sell the quantity of that product we are committed to purchase from our manufacturers prior to that product's expiration, we will incur inventory losses and/or losses on our purchase commitments. To the extent any of the products we manufacture become less available because of supply constraints or other events beyond our control, our current customers may begin to favor a competing agent or a competing diagnostic modality which could have a material adverse effect on our business, results of operation, financial condition and cash flows.

        Our current portfolio of products primarily focuses on heart disease and vascular disease. This particular focus, however, may not be in our long-term best interest if the incidence and prevalence of heart disease and vascular disease decrease over time. Despite the aging population in the affluent parts of the world where diagnostic medical imaging is most frequently used, government and private efforts to promote preventative cardiac care through exercise, diet and improved medications could decrease the overall demand for our products, which could have a material adverse effect on our business, results of operations, financial condition and cash flows.

The process of developing new drugs is complex, time-consuming and costly, and the outcome is not certain.

        Two of our pipeline candidates (our PET perfusion contrast agent and our cardiac neuronal imaging agent) are currently in clinical development, while a third pipeline candidate (our vascular remodeling agent) is in pre-clinical development at the lead optimization stage. To obtain regulatory approval for these product candidates, we must conduct extensive human tests, which are referred to as clinical trials, as well as meet other rigorous regulatory requirements. Satisfaction of all regulatory requirements typically takes many years and requires the expenditure of substantial resources. A number of other factors may cause significant delays in the completion of our clinical trials, including unexpected delays in the initiation of clinical sites, slower than projected enrollment, competition with ongoing clinical trials and scheduling conflicts with participating clinicians, regulatory requirements, limits on manufacturing capacity and failure of a product candidate to meet required standards for administration to humans. In addition, it may take longer than we project to achieve study endpoints and complete data analysis for a trial.

        Our product candidates are also prone to the risks of failure inherent in drug development and testing. The results of preliminary studies do not predict clinical success, and larger and later-stage clinical trials may not produce the same results as earlier-stage trials. Sometimes, product candidates that have shown promising results in early clinical trials have subsequently suffered significant setbacks in later clinical trials. Product candidates in later-stage clinical trials may fail to show desired safety and efficacy traits, despite having progressed through initial clinical testing. Further, the data collected from clinical trials of our product candidates may not be sufficient to support regulatory approval, or regulators could interpret the data differently and less favorably than we do. Further, the design of a

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clinical trial can determine whether its results will support approval of a product, and flaws in the design of a clinical trial may not become apparent until the clinical trial is well advanced. Clinical trials of potential products often reveal that it is not practical or feasible to continue development efforts. Regulatory authorities may require us or our partners to conduct additional clinical testing, in which case we would have to expend additional time and resources. The approval process may also be delayed by changes in government regulation, future legislation or administrative action or changes in regulatory policy that occur prior to or during regulatory review. The failure to provide clinical and preclinical data that are adequate to demonstrate to the satisfaction of the regulatory authorities that our product candidates are safe and effective for their proposed use will delay or preclude approval and will prevent us from marketing those products.

        Even if our product candidates proceed successfully through clinical trials and receive regulatory approval, there is no guarantee that an approved product can be manufactured in commercial quantities at reasonable cost or that such a product will be successfully marketed. For example, our PPA will require the creation of a complex, field-based manufacturing and distribution network involving PET cyclotrons located at radiopharmacies where the agent will be manufactured and distributed rapidly to end-users, given the agent's 110-minute half-life. Our development costs will increase if we are required to complete additional or larger clinical trials with respect to product candidates. If the delays or costs are significant, our financial results and our ability to commercialize our product candidates will be adversely affected.

In the United States, we are heavily dependent on a few large customers to generate a majority of our revenues for our nuclear imaging products. Outside of the United States, we rely on distributors to generate a substantial portion of our revenue.

        In the United States, we rely on a limited number of radiopharmacy chains, primarily Cardinal Health, Inc. ("Cardinal"), United Pharmacy Partners, Inc. ("UPPI") and GE Healthcare, to distribute our current largest volume nuclear imaging products and generate a majority of our revenues. These three customers accounted for approximately 55% of our total revenues in 2009, with Cardinal, UPPI and GE Healthcare accounting for 30%, 16% and 9%, respectively. In June 2010, Triad Isotopes, a member of UPPI with 26 radiopharmacies in its specific group, completed the purchase of 37 additional U.S. radiopharmacies from Covidien. Among the existing radiopharmacies in the United States, continued consolidation or reorganization may have a negative effect on our business, results of operations, financial condition or cash flows. We generally have distribution arrangements with our major radiopharmacy customers pursuant to multi-year contracts, each of which is subject to renewal, from as soon as December 2010 until as late as December 2014. If we cannot renew these contracts, it could have a material adverse effect on our business, results of operations, financial condition and cash flows.

        Outside of the United States, Canada, Australia and Puerto Rico, we have no radiopharmacies or sales force and therefore rely on distributors, either on a country-by-country basis or on a multi-country, regional basis, to market, distribute and sell our products. In certain circumstances, these distributors may also sell competing products to our own or products for competing diagnostic modalities. As a result, we cannot assure you that our international distributors will increase or maintain our current levels of unit sales or increase or maintain our current unit pricing, which, in turn, could have a material adverse effect on our business, results of operations, financial condition and cash flows.

In the ordinary course of business, we may be subject to product liability claims and lawsuits, including potential class actions, alleging that our products have resulted or could result in an unsafe condition or injury.

        Any product liability claim brought against us, with or without merit, could be costly to defend and could result in an increase of our insurance premiums. Although we have not had any such claims to

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date, claims that could be brought against us might not be covered by our insurance policies. Furthermore, even where the claim is covered by our insurance, our insurance coverage might be inadequate and we would have to pay the amount of any settlement or judgment that is in excess of our policy limits. We may not be able to obtain insurance on terms acceptable to us or at all, since insurance varies in cost and can be difficult to obtain. Our failure to maintain adequate insurance coverage or successfully defend against product liability claims could have a material adverse effect on our business, results of operations, financial condition and cash flows.

We use hazardous materials in our business and must comply with environmental laws and regulations, which can be expensive.

        Our operations use hazardous materials and produce hazardous wastes, including radioactive, chemical and in certain circumstances biological materials and wastes. We are subject to a variety of federal, state and local laws and regulations as well as non-U.S. laws and regulations relating to the transport, use, handling, storage and disposal of, and exposure to, these materials and wastes. Environmental laws and regulations are complex, change frequently and have become more stringent over time. We are required to obtain, maintain and renew various environmental and nuclear permits. Although we believe that our safety procedures for transporting, using, handling, storing and disposing of, and limiting exposure to, these materials and wastes complies with the standards prescribed by applicable laws and regulations, the risk of accidental contamination or injury cannot be eliminated. We place a high priority in these safety procedures and seek to limit any inherent risks. We generally contract with third parties for the disposal of wastes generated by our operations, and, prior to disposal, store any low level radioactive waste at our facilities until the materials are no longer considered radioactive. We cannot assure you that we have been or will be in compliance with environmental and health and safety laws at all times. If we violate these laws, we could be fined, criminally charged or otherwise sanctioned by regulators. We may be required to incur further costs to comply with current or future environmental and safety laws and regulations. In addition, in the event of accidental contamination or injury from these materials, we could be held liable for any damages that result and any such liability could exceed our resources.

        While we have budgeted for future capital and operating expenditures to maintain compliance with these laws and regulations, we cannot assure you that our costs of complying with current or future environmental protection, health and safety laws and regulations will not exceed our estimates or adversely affect our results of operations and financial condition. Further, we cannot assure you that we will not be subject to additional environmental claims for personal injury or cleanup in the future based on our past, present or future business activities.

If we are unable to protect our intellectual property, our competitors could develop and market products with features similar to our products, and demand for our products may decline.

        Our commercial success will depend in part on obtaining and maintaining patent protection and trade secret protection of our technologies and product candidates as well as successfully defending these patents and trade secrets against third party challenges. We will only be able to protect our intellectual property from unauthorized use by third parties to the extent that valid and enforceable patents or trade secrets cover them.

        The patent positions of pharmaceutical and biotechnology companies can be highly uncertain and involve complex legal and factual questions for which important legal principles remain unresolved. In addition, changes in either the patent laws or in interpretations of patent laws in the United States or other countries may diminish the value of our intellectual property. Accordingly, we cannot predict the breadth of claims that may be allowed or enforced in our patents or in third party patents.

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        The degree of future protection for our proprietary rights is uncertain because legal means afford only limited protection and may not adequately protect our rights or permit us to gain or keep our competitive advantage. For example:

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we might not have been the first to make the inventions covered by each of our pending patent applications and issued patents, and we could lose our patent rights as a result;



•

we might not have been the first to file patent applications for these inventions or our patent applications may not have been timely filed, and we could lose our patent rights as a result;



•

others may independently develop similar or alternative technologies or duplicate any of our technologies;



•

it is possible that none of our pending patent applications will result in any further issued patents;



•

our issued patents may not provide a basis for commercially viable drugs, may not provide us with any protection from unauthorized use of our intellectual property by third parties, and may not provide us with any competitive advantages;



•

our patent applications or patents may be subject to interference, opposition or similar administrative proceedings;



•

we may not develop additional proprietary technologies that are patentable; or



•

the patents of others may have an adverse effect on our business.

        Moreover, the issuance of a patent is not conclusive as to its validity or enforceability. A third party may challenge the validity or enforceability of a patent even after its issuance by the U.S. Patent and Trademark Office. It is also uncertain how much protection, if any, will be afforded by our patents if we attempt to enforce them and they are challenged in court or in other proceedings, such as oppositions, which may be brought in U.S. or non-U.S. jurisdictions to challenge the validity of a patent.

        The defense and prosecution of intellectual property suits, interferences, oppositions and related legal and administrative proceedings in the United States are costly, time consuming to pursue and result in diversion of resources. The outcome of these proceedings is uncertain and could significantly harm our business. If we are not able to defend the patents of our technologies and products, then we will not be able to exclude competitors from marketing products that directly compete with our products, which could have a material adverse effect on our business, results of operations, financial condition and cash flows.

        We will also rely on trade secrets to protect our technology, especially where we do not believe patent protection is appropriate or obtainable. However, trade secrets are difficult to protect. We use reasonable efforts to protect our trade secrets, but our employees, consultants, contractors, outside scientific partners and other advisors may unintentionally or willfully disclose our confidential information to competitors or other third parties. Enforcing a claim that a third party improperly obtained and is using our trade secrets is expensive and time consuming, and the outcome is unpredictable. In addition, courts outside the United States are sometimes less willing to protect trade secrets. Moreover, our competitors may independently develop equivalent knowledge, methods and know-how. We often rely on confidentiality agreements with our collaborators, employees, consultants and other third parties and invention assignment agreements with our employees to protect our trade secrets and other know-how and proprietary information concerning our business. These confidentiality agreements may not prevent unauthorized disclosure of trade secrets and other proprietary information, and there can be no guarantee that an employee or an outside party will not make an unauthorized disclosure of our trade secrets, other technical know-how or proprietary information. We may not have adequate remedies for any unauthorized disclosure. This might happen intentionally or inadvertently. It

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is possible that a competitor will make use of such information, and that our competitive position will be compromised, in spite of any legal action we might take against persons making such unauthorized disclosures, which could have a material adverse effect on our business, results of operations, financial condition and cash flows.

        We rely on our trademarks, trade names, and brand names to distinguish our products from the products of our competitors, and have registered or applied to register many of these trademarks, including DEFINITY, Cardiolite, TechneLite, Ablavar, Neurolite and Lantheus Medical Imaging, Inc. We cannot assure you that our trademark applications will be approved. Third parties may also oppose our trademark applications, or otherwise challenge our use of the trademarks. If our trademarks are successfully challenged, we could be forced to rebrand our products, which could result in loss of brand recognition, and could require us to devote resources advertising and marketing new brands. Further, we cannot assure you that competitors will not infringe our trademarks, or that we will have adequate resources to enforce our trademarks.

We may be subject to claims that we have infringed, misappropriated or otherwise violated the patent or other intellectual property rights of a third party. The outcome of any such claims is uncertain and any unfavorable result could adversely affect our business, financial condition and results of operations.

        We may be subject to claims by third parties that we have infringed, misappropriated or otherwise violated their intellectual property rights. While we believe that the products that we currently manufacture using our proprietary technology do not infringe upon or otherwise violate proprietary rights of other parties or that meritorious defenses would exist with respect to any assertions to the contrary, we cannot assure you that we would not be found to infringe on or otherwise violate the proprietary rights of others.

        We may be subject to litigation over infringement claims regarding the products we manufacture or distribute. This type of litigation can be costly and time consuming and could generate significant expenses, damage payments (potentially including treble damages) or restrictions or prohibitions on our use of our technology, which could adversely affect our results of operations. In addition, if we are found to be infringing on proprietary rights of others, we may be required to develop non-infringing technology, obtain a license (which may not be available on reasonable terms, or at all), make substantial one-time or ongoing royalty payments, or cease making, using and/or selling the infringing products, any of which could have a material adverse effect on our business, results of operations, financial condition and cash flows.

We face significant competition in our business and may not be able to compete effectively.

        The market for diagnostic medical imaging agents is highly competitive and continually evolving. Our principal competitors in existing diagnostic modalities include large, global companies with substantial financial, manufacturing, sales and marketing, and logistics resources that are more diversified than us, such as Covidien, GE Healthcare, Bayer Schering Pharma AG and Bracco Diagnostics Inc. ("Bracco"), as well as other competitors. We cannot anticipate their competitive actions, such as price reductions on products that are comparable to our own, development of new products that are more cost-effective or have superior performance than our current products, and the introduction of generic versions when our proprietary products lose their patent protection. Our current or future products could be rendered obsolete or uneconomical as a result of this competition. Our failure to compete effectively could cause us to lose market share to our competitors and have a material adverse effect on our business, results of operations, financial condition and cash flows.

        Generic competition has eroded our share for Cardiolite and will likely continue to do so. We are currently aware of four separate generic offerings of sestamibi. To the extent generic competitors further reduce their prices, we may be forced to further reduce the price of Cardiolite, which would have an adverse effect on our business, results of operations, financial condition and cash flows.

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We may be adversely affected by the current economic environment.

        Our ability to attract and retain customers, invest in and grow our business and meet our financial obligations depends on our operating and financial performance, which, in turn, is subject to numerous factors, including the prevailing economic conditions and financial, business and other factors beyond our control, such as the rate of unemployment and the number of uninsured persons in the United States. We cannot anticipate all the ways in which the current economic climate and financial market conditions could adversely impact our business.

        We are exposed to risks associated with reduced profitability and the potential financial instability of our customers, many of whom may be adversely affected by the volatile conditions in the financial markets. For example, unemployment and underemployment, and the resultant loss of insurance, may decrease the demand for healthcare services and pharmaceuticals. If fewer patients are seeking medical care because they do not have insurance coverage, our customers may experience reductions in profitability and/or cash flow problems that could lead them to modify, delay or cancel orders for our products. If customers are not successful in generating sufficient revenue or are precluded from securing financing, they may not be able to pay, or may delay payment of, accounts receivable that are owed to us. This, in turn, could adversely affect our financial condition and liquidity. In addition, if economic challenges in the United States result in widespread and prolonged unemployment, either regionally or on a national basis, prior to the effectiveness of certain provisions of the Healthcare Reform Act, a substantial number of people may become uninsured or underinsured. In turn, this may lead to fewer individuals pursuing or being able to afford diagnostic medical imaging procedures. To the extent economic challenges result in fewer procedures being performed, our business, results of operations, financial condition and cash flows could be adversely affected.

Our business is subject to international economic, political and other risks that could negatively affect our results of operations or financial position.

        A significant portion of our revenues are derived from countries outside the United States, and we anticipate that revenue from non-U.S. operations may grow. Accordingly, our business is subject to risks associated with doing business internationally, including:

•

less stable political and economic environments and changes in a specific country's or region's political or economic conditions;



•

potential negative consequences from changes in tax laws affecting our ability to repatriate profits;



•

unfavorable labor regulations;



•

greater difficulties in relying on non-U.S. courts to enforce either local or U.S. laws, particularly with respect to intellectual property;



•

greater difficulties in managing and staffing non-U.S. operations;



•

the need to ensure compliance with the numerous regulatory and legal requirements applicable to our business in each of these jurisdictions and to maintain an effective compliance program to ensure compliance with these requirements;



•

currency fluctuations;



•

changes in trade policies, regulatory requirements and other barriers;



•

civil unrest or other catastrophic events; and



•

longer payment cycles of non-U.S. customers and difficulty collecting receivables in non-U.S. jurisdictions.

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        These factors are beyond our control. The realization of any of these or other risks associated with operating in non-U.S. countries could have a material adverse effect on our business, results of operations or financial condition.

We face currency and other risks associated with international sales.

        We generate significant revenue from export sales, as well as from operations conducted outside the United States. Operations outside the United States expose us to risks including fluctuations in currency values, trade restrictions, tariff and trade regulations, U.S. export controls, non-U.S. tax laws, shipping delays, and economic and political instability. For example, violations of U.S. export controls could result in fines and the suspension or loss of export privileges which could have a material adverse affect on our business, results of operations, financial conditions and cash flows.

        The functional currency of each of our non-U.S. operations is generally the local currency. Exchange rates between some of these currencies and U.S. Dollars have fluctuated significantly in recent years and may do so in the future. It is possible that fluctuations in exchange rates will have a negative effect on our results of operations.

Many of our customer relationships outside of the United States are, either directly or indirectly, with governmental entities, and we could be adversely affected by violations of the U.S. Foreign Corrupt Practices Act and similar worldwide anti-bribery laws outside the United States.

        The U.S. Foreign Corrupt Practices Act and similar worldwide anti-bribery laws in non-U.S. jurisdictions generally prohibit companies and their intermediaries from making improper payments to non-U.S. officials for the purpose of obtaining or retaining business. Because of the predominance of government-sponsored healthcare systems around the world, many of our customer relationships outside of the United States are, either directly or indirectly, with governmental entities and are therefore subject to such anti-bribery laws. Our policies mandate compliance with these anti-bribery laws. We operate in many parts of the world that have experienced governmental corruption to some degree, and in certain circumstances strict compliance with anti-bribery laws may conflict with local customs and practices. Despite our training and compliance programs, our internal control policies and procedures may not always protect us from reckless or criminal acts committed by our employees or agents. Violations of these laws, or allegations of such violations, could disrupt our business and result in a material adverse effect on our results of operations, financial condition and cash flows.

Our business depends on the continued effectiveness and availability of our information technology infrastructure, and failures of this infrastructure could harm our operations.

        To remain competitive in our industry, we must employ information technologies to support manufacturing processes, quality processes, distribution, R&D and regulatory applications that capture, manage and analyze the large streams of data generated in our clinical trials in compliance with applicable regulatory requirements. We rely extensively on technology to allow the concurrent conduct of work sharing around the world. As with all information technology, our systems are vulnerable to potential damage or interruptions from fires, blackouts, telecommunications failures and other unexpected events, as well as to break-ins, sabotage or intentional acts of vandalism. Given the extensive reliance of our business on technology, any substantial disruption or resulting loss of data that is not avoided or corrected by our backup measures could harm our business, operations and financial condition.

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We may not be able to hire or retain the number of qualified personnel, particularly scientific, medical and sales personnel, required for our business, which would harm the development and sales of our products and limit our ability to grow.

        Competition in our industry for highly skilled scientific, healthcare and sales personnel is intense. If we are unable to retain our existing personnel, or attract and train additional qualified personnel, either because of competition in our industry for such personnel or because of insufficient financial resources, our growth may be limited and it could have a material adverse effect on our business.

If we lose the services of our key personnel, our business could be adversely affected.

        Our success is substantially dependent upon the performance, contributions and expertise of our chief executive officer, executive leadership and senior management team. Some members of our executive leadership and senior management team play a significant role in generating new business and retaining existing customers. Our inability to retain our existing executive leadership and senior management team or attract and retain additional qualified personnel could have a materially adverse effect on our business.

We will incur substantial ongoing costs as a result of being obligated to file reports under the Securities Exchange Act of 1934, as amended, or the Exchange Act, and our management will be required to devote substantial time to new compliance initiatives.

        In connection with this exchange offer, we will be required to file annual, quarterly and current reports under the Exchange Act with the Commission with respect to our business and financial condition. In addition, the Sarbanes-Oxley Act of 2002 (the "Sarbanes-Oxley Act") and the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010, as well as rules subsequently implemented by the Commission have imposed various requirements on public companies, including the establishment and maintenance of effective disclosure controls and procedures, internal controls and corporate governance practices. Accordingly, we will incur significant legal, accounting and other expenses that we did not incur as a private company.

        The Sarbanes-Oxley Act requires, among other things, that we maintain effective internal controls for financial reporting and disclosure. While we currently have internal policies and procedures in place relating to financial reporting which are adequate for a privately-held company, we are not yet in compliance with the Sarbanes-Oxley Act. In order to maintain and improve the effectiveness of our disclosure controls and procedures and internal controls over financial reporting to be compliant with the Sarbanes-Oxley Act, significant resources and management oversight will be required. This may divert management's attention from other business concerns which could harm our business, results of operations and financial condition, and substantially increase our accounting, legal and compliance costs.

Risks Related to the Notes

We have a substantial amount of indebtedness which may limit our financial and operating activities and may adversely affect our ability to incur additional debt to fund future needs.

        As of June 30, 2010, we had approximately $250.0 million of total indebtedness. In addition, we have up to $42.5 million of additional borrowing capacity under our revolving credit facility. Our substantial indebtedness and any future indebtedness we incur could:

•

require us to dedicate a substantial portion of cash flow from operations to the payment of principal, and interest on, indebtedness, thereby reducing the funds available for other purposes;



•

make it more difficult for us to satisfy and comply with our obligations with respect to the notes;

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•

subject us to increased sensitivity to interest rate increases;



•

make us more vulnerable to economic downturns, adverse industry conditions or catastrophic external events;



•

limit our ability to withstand competitive pressures;



•

reduce our flexibility in planning for or responding to changing business, industry and economic conditions; and/or



•

place us at a competitive disadvantage to competitors that have relatively less debt than we have.

        In addition, our substantial level of indebtedness could limit our ability to obtain additional financing on acceptable terms, or at all, for working capital, capital expenditures and general corporate purposes. Our liquidity needs could vary significantly and may be affected by general economic conditions, industry trends, performance and many other factors not within our control.

Despite our substantial indebtedness, we may incur more debt, which could exacerbate the risks described above.

        We and our subsidiaries may be able to incur substantial additional indebtedness in the future subject to the limitations contained in the agreements governing our debt. Although these agreements restrict us and our restricted subsidiaries from incurring additional indebtedness, these restrictions are subject to important exceptions and qualifications. If we or our subsidiaries incur additional debt, the risks that we and they now face as a result of our high leverage could intensify. In addition, the indenture governing the notes and the agreement governing our revolving credit facility will not prevent us from incurring obligations that do not constitute indebtedness under the agreements.

Our debt agreements will contain restrictions that will limit our flexibility in operating our business.

        The indenture governing the notes and the agreement governing our revolving credit facility contain various covenants that limit our ability to engage in specified types of transactions. These covenants limit our and our restricted subsidiaries' ability to, among other things:

•

incur additional debt;



•

pay dividends or make other distributions;



•

redeem stock;



•

issue stock of subsidiaries;



•

make certain investments;



•

create liens;



•

enter into transactions with affiliates; and



•

merge, consolidate or transfer all or substantially all of our assets.

        Additionally, the agreement governing our revolving credit facility requires us to maintain certain financial ratios. A breach of any of these covenants could result in a default under the indenture governing the notes and the agreement governing our revolving credit facility. We may also be unable to take advantage of business opportunities that arise because of the limitations imposed on us by the restrictive covenants under our indebtedness.

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We may not be able to generate sufficient cash flow to meet our debt service obligations.

        Our ability to generate sufficient cash flow from operations to make scheduled payments on our debt obligations will depend on our future financial performance, which will be affected by a range of economic, competitive and business factors, many of which are outside of our control. If we do not generate sufficient cash flow from operations to satisfy our debt obligations, including interest payments and the payment of principal at maturity, we may have to undertake alternative financing plans, such as refinancing or restructuring our debt, selling assets, entering into corporate collaborations or licensing arrangements for one or more of our product candidates, reducing or delaying capital investments or seeking to raise additional capital. We cannot assure you that any refinancing would be possible, that any assets could be sold, licensed or partnered, or, if sold, licensed or partnered, of the timing of the transactions and the amount of proceeds realized from those transactions, that additional financing could be obtained on acceptable terms, if at all, or that additional financing would be permitted under the terms of our various debt instruments then in effect. Furthermore, our ability to refinance would depend upon the condition of the finance and credit markets. Our inability to generate sufficient cash flow to satisfy our debt obligations, or to refinance our obligations on commercially reasonable terms or on a timely basis, would have an adverse effect on our business, results of operations and financial condition.

Your right to receive payments on the notes is effectively subordinated to the rights of our existing and future secured creditors. Further, the guarantees of the notes will be effectively subordinated to all of the guarantors' existing and future secured indebtedness.

        Holders of our existing or future secured indebtedness and holders of existing or any future secured indebtedness of the guarantors will have claims that are prior to your claims as holders of the notes to the extent of the value of the assets securing that other indebtedness. The notes will be effectively subordinated to all of that secured indebtedness, including indebtedness under our revolving credit facility and any other future senior secured credit facility. In the event of any distribution or payment of our or the guarantors' assets in any foreclosure, dissolution, winding-up, liquidation, reorganization or other bankruptcy proceeding, holders of secured indebtedness will have a prior claim to those assets that constitute their collateral. Holders of the notes will participate in the distribution or payment of our and the guarantors' remaining assets ratably with all holders of our and the guarantors' unsecured indebtedness that is deemed to be of the same class as the notes, and potentially with all of our other general creditors, based upon the respective amounts owed to each holder or creditor. In any of the foregoing events, we cannot assure you that there will be sufficient assets to pay amounts due on the notes. As a result, holders of notes may receive less, ratably, than holders of secured indebtedness.

The notes are effectively subordinated to the liabilities of our subsidiaries that do not guarantee the notes.

        Certain of our subsidiaries, including all of our non-U.S. subsidiaries, will not guarantee the notes. To the extent that any of our subsidiaries do not guarantee the notes, the notes will be structurally subordinated to all existing and future obligations, including indebtedness, of such non-guarantor subsidiaries. The claims of creditors of the non-guarantor subsidiaries, including trade creditors, will have priority as to the assets of those subsidiaries.

        For the year ended December 31, 2009, our non-guarantor subsidiaries accounted for approximately 19.5% of our total revenues. In addition, as of December 31, 2009, our non-guarantor subsidiaries held approximately 11.3% of our consolidated assets and had approximately 10% of liabilities (including trade payables), to which the notes and guarantees would have been structurally subordinated.

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We are permitted to create unrestricted subsidiaries, which will not provide guarantees of the notes or be subject to any of the covenants in the indenture, and we may not be able to rely on the cash flow or assets of those unrestricted subsidiaries to pay our indebtedness.

        Unrestricted subsidiaries will not provide guarantees of the notes or be subject to the covenants under the indenture governing the notes. As a result, our unrestricted subsidiaries will be able to engage in many of the activities that we and our restricted subsidiaries are prohibited or limited from doing under the terms of the indenture governing the notes, such as selling, conveying or distributing assets, incurring additional debt, pledging assets, guaranteeing debt, paying dividends, making investments and entering into mergers or other business combinations, subject to certain restrictive covenants in any of their financing documents, as applicable. These actions could be detrimental to our ability to make payments of principal and interest when due and to comply with our other obligations under the notes, and may reduce the amount of our assets that will be available to satisfy your claims should we default on the notes. As of June 30, 2010, we did not have any unrestricted subsidiaries.

We may choose to redeem notes when prevailing interest rates are relatively low.

        We may choose to redeem the notes from time to time, especially when prevailing interest rates are lower than the rate borne by the notes. If prevailing rates are lower at the time of redemption, you would not be able to reinvest the redemption proceeds in a comparable security at an effective interest rate as high as the interest rate on the notes being redeemed. Our redemption right also may adversely impact your ability to sell your notes as the optional redemption date or period approaches.

Federal and state statutes allow courts, under specific circumstances, to avoid guarantees and to require noteholders to return payments received from us or the guarantors.

        Our creditors or the creditors of our guarantors could challenge the guarantees as fraudulent conveyances or on other grounds. Under the federal bankruptcy law and comparable provisions of state fraudulent transfer laws, the delivery of the guarantees could be avoided as fraudulent transfers if a court determined that the applicable guarantor, at the time it incurred the indebtedness evidenced by its guarantee or granted its lien:

•

delivered the guarantee with the intent to hinder, delay or defraud its existing or future creditors; or



•

received less than reasonably equivalent value or did not receive fair consideration for the delivery of the guarantee, and that such guarantor was insolvent or rendered insolvent at the time it delivered the guarantee;



•

was engaged in a business or transaction for which such guarantor's remaining assets constituted unreasonably small capital; or



•

intended to incur, or believed that it would incur, debts beyond its ability to pay such debts as they mature.

        If the guarantees were avoided or limited under fraudulent transfer or other laws, any claim you may make against us for amounts payable on the notes would be effectively subordinated to all of the indebtedness and other obligations of our guarantors, including trade payables and any subordinated indebtedness.

        The measures of insolvency for purposes of these fraudulent transfer laws will vary depending upon the law applied in any proceeding to determine whether a fraudulent transfer has occurred. Generally, however, a guarantor would be considered insolvent if:

•

the sum of its debts, including contingent liabilities, was greater than the fair saleable value of all of its assets;

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•

if the present fair saleable value of its assets was less than the amount that would be required to pay its probable liability on its existing debts, including contingent liabilities, as they became absolute and matured; or



•

it could not pay its debts as they became due.

        We cannot be sure what standard a court would apply in making these determinations or, regardless of the standard, that a court would not void the guarantees or that any guarantee would not be subordinated to a guarantor's other indebtedness. In a recent Florida bankruptcy case, a similar provision was found to be ineffective to protect the guarantees.

Any future note guarantees provided after the notes are issued could also be avoided by a trustee in bankruptcy.

        The indenture governing the notes provides that certain of our future subsidiaries will guarantee the notes. Any future note guarantee for the benefit of the noteholders might be avoidable by the grantor (as debtor-in-possession) or by its trustee in bankruptcy or other third parties if certain events or circumstances exist or occur. For instance, if the entity granting the future note guarantee were insolvent at the time of the grant and if such grant was made within 90 days, or in certain circumstances, a longer period, before that entity commenced a bankruptcy proceeding, and the granting of the future note guarantee enabled the noteholders to receive more than they would if the grantor were liquidated under Chapter 7 of the U.S. Bankruptcy Code, then such note guarantee could be avoided as a preferential transfer.

We may not be able to fulfill our repurchase obligations with respect to the notes upon a change of control.

        If we experience certain specific change of control events, we will be required to offer to repurchase all of our outstanding notes at 101% of the principal amount of such notes plus accrued and unpaid interest to the date of repurchase. We cannot assure you that we will have available funds sufficient to pay the change of control purchase price for any or all of the notes that might be tendered in the change of control offer.

        The definition of change of control in the indenture governing the notes offered hereby includes a phrase relating to the direct or indirect sale, transfer, conveyance or other disposition of "all or substantially all" of our and our restricted subsidiaries' assets, taken as a whole. Although there is a limited body of case law interpreting the phrase "substantially all," there is no precise established definition of the phrase under applicable law. Accordingly, the ability of a holder of notes to require us to repurchase such notes as a result of a sale, transfer, conveyance or other disposition of less than all of our and our "restricted subsidiaries" assets taken as a whole to another person or group may be uncertain. In addition, a recent Delaware Chancery Court decision raised questions about the enforceability of provisions, which are similar to those in the indenture governing the notes offered hereby, related to the triggering of a change of control as a result of a change in the composition of a board of directors. Accordingly, the ability of a holder of notes to require us to repurchase notes as a result of a change in the composition of our board of directors may be uncertain.

        In addition, our revolving credit facility contains, and any future credit agreement likely will contain, restrictions or prohibitions on our ability to repurchase the notes under certain circumstances. If these change of control events occur at a time when we are prohibited from repurchasing the notes, we may seek the consent of our lenders to purchase the notes or could attempt to refinance the borrowings that contain these prohibitions or restrictions. If we do not obtain our lender's consent or refinance these borrowings, we will not be able to repurchase the notes. Accordingly, the holders of the notes may not receive the change of control purchase price for their notes in the event of a sale or other change of control, which will give the trustee and the holders of the notes the right to declare an

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event of default and accelerate the repayment of the notes. See "Description of the Exchange Notes—Repurchase at the Option of Holders—Change of Control."

An adverse rating of the notes may cause their trading price to fall.

        Multiple rating agencies have assigned ratings to the notes. Ratings agencies, however, may lower ratings on the notes or any of our other debt in the future. If rating agencies maintain a lower than-expected rating or reduce, or indicate that they may reduce, their ratings of our debt in the future, the trading price of the notes could significantly decline.

If a bankruptcy petition were filed by or against us, holders of notes may receive a lesser amount for their claim than they would have been entitled to receive under the indenture governing the notes.

        If a bankruptcy petition were filed by or against us under the U.S. Bankruptcy Code after the issuance of the notes, the claim by any holder of the notes for the principal amount of the notes may be limited to an amount equal to the sum of:

•

the original issue price for the notes; and



•

that portion of the original issue discount, if any, that does not constitute "unmatured interest" for purposes of the U.S. Bankruptcy Code.

        Any original issue discount that was not amortized as of the date of the bankruptcy filing would constitute unmatured interest. Accordingly, holders of the notes under these circumstances may receive a lesser amount than they would be entitled to receive under the terms of the indenture governing the notes, even if sufficient funds are available.

We are indirectly owned and controlled by Avista and their interests may conflict with yours as a creditor.

        Avista and an affiliated co-investment vehicle collectively own approximately 99.5% of Holdings, which is the sole stockholder of Lantheus Intermediate, our parent company. As a result, Avista has the power to elect our board of directors and effectively has control over major decisions regardless of whether holders of the notes believe that any such decisions are in their own best interests. The interests of Avista as an equity holder may conflict with your interests as a holder of the notes. Avista may have an incentive to increase the value of its investment or cause us to distribute funds at the expense of our financial condition and affect our ability to make payments on the notes. In addition, Avista may have an interest in pursuing acquisitions, divestitures, financings or other transactions that it believes could enhance its equity investments even though such transactions might involve risks to you as a holder of the notes.

Risks Related to the Exchange Offer

Your Restricted Notes will not be accepted for exchange if you fail to follow the exchange offer procedures.

        We will not accept your Restricted Notes for exchange if you do not follow the exchange offer procedures. We will issue Exchange Notes as part of the exchange offer only after a timely receipt of your Restricted Notes, a properly completed and duly executed letter of transmittal and all other required documents. Therefore, if you wish to tender your Restricted Notes, please allow sufficient time to ensure timely delivery. If we do not receive your Restricted Notes, letter of transmittal and other required documents by the time of expiration of the exchange offer, we will not accept your Restricted Notes for exchange. We are under no duty to give notification of defects or irregularities with respect to the tenders of Restricted Notes for exchange. If there are defects or irregularities with respect to your tender of Restricted Notes, we will not accept your Restricted Notes for exchange.

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If you do not exchange your Restricted Notes, there will be restrictions on your ability to resell your Restricted Notes.

        Following the exchange offer, Restricted Notes that you do not tender, that we do not accept or that do not qualify to be registered in a "shelf" registration form will be subject to transfer restrictions. Absent registration, any untendered Restricted Notes may therefore only be offered or sold pursuant to an exemption from, or in a transaction not subject to, the registration requirements of the Securities Act and applicable state securities laws or pursuant to an effective registration statement. If no such exemption is available, you will not be able to sell your notes.

There is no public market for the Exchange Notes, and we cannot assure you that a market for the Exchange Notes will develop.

        The Exchange Notes are a new issue of securities for which there is currently no active trading market. We do not intend to file an application to have the Exchange Notes listed on any securities exchange or included for quotation on any automated dealer quotation system. Although the initial purchasers in the original issuance indicated that they intend to make a market in the notes as over-the-counter securities that are not traded on an exchange, they have no obligation to do so and may discontinue market-making activity at any time without notice.

        If any of the Exchange Notes are traded after their initial issuance, they may trade at a discount from their initial offering price, depending upon prevailing interest rates, the market for similar securities and other factors, including general economic conditions, our financial condition, performance and prospects and prospects for companies in our industry generally. In addition, the liquidity of the trading market in the Exchange Notes and the market prices quoted for the Exchange Notes may be negatively affected by changes in the overall market for high-yield securities. As a result, we cannot assure you that an active trading market will develop for the Exchange Notes.

        In addition, we have the right, pursuant to the registration rights agreement, to suspend the use of the registration statement in certain circumstances. In the event of such a suspension you would not be able to sell the notes under the registration statement.

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CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

        Some of the statements contained in this prospectus are forward-looking statements within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act, including, in particular, statements about our plans, strategies, prospects and industry estimates. These statements identify prospective information and include words such as "anticipates," "intends," "plans," "seeks," "believes," "estimates," "expects," "should," "predicts," "hopes" and similar expressions. Examples of forward-looking statements include, but are not limited to, statements we make regarding: (i) our liquidity, including our belief that our existing cash, cash equivalents and anticipated revenues are sufficient to fund our existing operating expenses, capital expenditures and liquidity requirements for at least the next twelve months; (ii) our outlook and expectations for the balance of 2010 and 2011, including, without limitation, in connection with continued market expansion and penetration for certain of our commercial products; and (iii) expected new product launch dates and market exclusivity periods. The foregoing is not an exclusive list of all forward-looking statements we make. Forward-looking statements are based on our current expectations and assumptions regarding our business, the economy and other future conditions. Because forward-looking statements relate to the future, they are subject to inherent uncertainties, risks and changes in circumstances that are difficult to predict. Our actual results may differ materially from those contemplated by the forward-looking statements. They are neither statements of historical fact nor guarantees or assurances of future performance. The matters referred to in the forward-looking statements contained in this prospectus may not in fact occur. We caution you therefore against relying on any of these forward-looking statements. Important factors that could cause actual results to differ materially from those in the forward-looking statements include regional, national or global political, economic, business, competitive, market and regulatory conditions and the following:

•

our dependence on a limited number of third party suppliers and the ongoing global Moly supply challenge;



•

our dependence upon third parties for the manufacture and supply of a substantial portion of our products;



•

our dependence upon third party healthcare payors and the uncertainty of third party coverage and reimbursement rates;



•

uncertainties regarding the impact of U.S. healthcare reform on our business;



•

our being subject to extensive government regulation and our potential inability to comply with such regulations;



•

problems with the quality or performance of our products;



•

liability associated with our marketing and sales practices;



•

the occurrence of side effects with our DEFINITY and Ablavar products;



•

our inability to introduce new products and adapt to changing technology and diagnostic landscape;



•

the extensive costs, time and uncertainty associated with new product development;



•

our dependence on key customers for our nuclear imaging products;



•

our exposure to product liability claims and environmental liability;



•

our inability to protect our intellectual property and the risk of claims that we have infringed on the intellectual property of others;



•

our inability to compete effectively;

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•

risks associated with the current economic environment;



•

risks associated with our international operations;



•

our inability to adequately protect our technology infrastructure;



•

our inability to hire or retain skilled employees and the loss of any of our key personnel;



•

costs and other risks associated with becoming a reporting company and becoming subject to the Sarbanes-Oxley Act; and



•

other factors that are described in "Risk Factors," beginning on page 15.

        Any forward-looking statement made by us in this prospectus speaks only as of the date on which it is made. Factors or events that could cause our actual results to differ may emerge from time to time, and it is not possible for us to predict all of them. We undertake no obligation to publicly update any forward-looking statement, whether as a result of new information, future developments or otherwise, except as may be required by law.

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THE EXCHANGE OFFER

Purpose and Effect

        We issued the Restricted Notes on May 10, 2010 in a transaction exempt from registration under the Securities Act. In connection with the original issuance, we entered into an indenture and a registration rights agreement. The registration rights agreement requires that we file a registration statement under the Securities Act with respect to the Exchange Notes to be issued in the exchange offer and, upon the effectiveness of the registration statement, offer you the opportunity to exchange your Restricted Notes for a like principal amount of Exchange Notes. Except as set forth below, these Exchange Notes will be issued without a restrictive legend and, we believe, may be reoffered and resold by you without registration under the Securities Act. After we complete the exchange offer, our obligations with respect to the registration of the Restricted Notes and the Exchange Notes will terminate. A copy of the registration rights agreement has been filed as an exhibit to the registration statement of which this prospectus forms a part. Notwithstanding anything to the contrary set forth in this prospectus, the exchange offer is not being made to you, and you may not participate in the exchange offer, if (a) you are our "affiliate" within the meaning of Rule 405 of the Securities Act or (b) you are a broker-dealer that acquired Restricted Notes directly from us.

        Based on interpretations by the staff of the Commission set forth in no-action letters issued to third parties unrelated to us, we believe that the Exchange Notes to be issued to you in the exchange offer may be offered for resale, resold and otherwise transferred by you, without compliance with the registration and prospectus delivery provisions of the Securities Act, unless you are a broker-dealer that receives Exchange Notes in exchange for Restricted Notes acquired by you as a result of market-making activities or other trading activities. This interpretation, however, is based on your representation to us that:

•

the Exchange Notes to be issued to you in the exchange offer are acquired in the ordinary course of your business;



•

at the time of the commencement of the exchange offer, you have no arrangement or understanding with any person to participate in the distribution (within the meaning of the Securities Act) of the Exchange Notes to be issued to you in the exchange offer in violation of the Securities Act;



•

you are not an affiliate (as defined in Rule 405 promulgated under the Securities Act) of us;



•

you are not engaging in, and do not intend to engage in, a distribution of the Exchange Notes to be issued to you in the exchange offer;



•

you are not acting on behalf of any persons or entities who could not truthfully make the foregoing representations.

        If you have any of the disqualifications described above or cannot make each of the representations set forth above, you may not rely on the interpretations by the staff of the Commission referred to above. Under those circumstances, you must comply with the registration and prospectus delivery requirements of the Securities Act in connection with a sale, transfer or other disposition of any notes unless you are able to utilize an applicable exemption from all of those requirements. In addition, each broker-dealer that receives Exchange Notes in the exchange offer for its own account in exchange for Restricted Notes that were acquired by the broker-dealer as a result of market-making activities or other trading activities, must acknowledge that it will deliver a prospectus meeting the requirements of the Securities Act in connection with any resales of those Exchange Notes. See "Plan of Distribution."

        If you will not receive freely tradable Exchange Notes in the exchange offer or are not eligible to participate in the exchange offer and the Restricted Notes held by you constitute Entitled Securities (as

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defined in the registrations rights agreement), you may elect to have your Restricted Notes registered in a "shelf" registration statement on an appropriate form pursuant to Rule 415 under the Securities Act. If we are obligated to file a shelf registration statement, we will be required to keep the shelf registration statement effective for a period of two years from May 10, 2010 or such shorter period that will terminate when (a) all of the notes covered by the shelf registration statement have been sold pursuant to the shelf registration statement, (b) we file a subsequent shelf registration statement or (c) there ceases to be any Restricted Notes. Other than as set forth in this paragraph, you will not have the right to require us to register your Restricted Notes under the Securities Act. See "—Procedures for Tendering Restricted Notes" below.

Terms of the Exchange Offer

        Upon the terms and subject to the conditions set forth in this prospectus and in the letter of transmittal, we will accept any and all Restricted Notes validly tendered and not withdrawn prior to 5:00 p.m., New York City time, on                        , 2010. We will issue $1,000 principal amount of Exchange Notes in exchange for each $1,000 principal amount of Restricted Notes accepted in the exchange offer. You may tender some or all of your Restricted Notes pursuant to the exchange offer. However, Restricted Notes may be tendered only in minimum denominations of $2,000 and any integral multiple of $1,000 in excess thereof.

        The form and terms of the Exchange Notes are substantially the same as the form and terms of the Restricted Notes, except that the Exchange Notes to be issued in the exchange offer have been registered under the Securities Act and will not bear legends restricting their transfer. The Exchange Notes will be issued pursuant to, and entitled to the benefits of, the indenture. The indenture also governs the Restricted Notes. Each series of Exchange Notes and Restricted Notes will be deemed a single issue of the respective series of notes under the indenture.

        As of the date of this prospectus, $250,000,000 aggregate principal amount of Restricted Notes are outstanding. This prospectus, together with the letter of transmittal, is being sent to all registered holders and to others believed to have beneficial interests in the Restricted Notes. We intend to conduct the exchange offer in accordance with the applicable requirements of the Exchange Act and the rules and regulations of the Commission promulgated under the Exchange Act.

        We will be deemed to have accepted validly tendered Restricted Notes when, as and if we have given oral or written notice of our acceptance to the exchange agent. The exchange agent will act as our agent for the tendering holders for the purpose of receiving the Exchange Notes from us. Any Restricted Notes not accepted for exchange for any reason will be returned without expense to an account maintained with DTC as promptly as practicable after the expiration or termination of the exchange offer.

        You will not be required to pay brokerage commissions or fees or, except as set forth below under "—Transfer Taxes," transfer taxes with respect to the exchange of your Restricted Notes in the exchange offer. We will pay all charges and expenses, other than applicable taxes, in connection with the exchange offer. See "—Fees and Expenses" below.

Expiration Date; Amendments

        The exchange offer will expire at 5:00 p.m., New York City time, on                        , 2010 unless we determine, in our sole discretion, to extend the exchange offer, in which case, it will expire at the later date and time to which it is extended. We do not intend to extend the exchange offer, although we reserve the right to do so. If we extend or terminate the exchange offer, we will give oral or written notice of the extension to the exchange agent and give each registered holder notice by means of a press release or other public announcement of any extension prior to 9:00 a.m., New York City time,

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on the next business day after the scheduled expiration date. We will not extend the exchange offer past                        , 2010.

        We also reserve the right, in our sole discretion,

(1)

to delay accepting any Restricted Notes, to the extent in a manner compliant with Rule 14e-1(c) of the Exchange Act, in the event the exchange offer are extended,



(2)

subject to applicable law and by complying with Rule 14e-1(d) under the Exchange Act to the extent that rule applies, to extend the exchange offer or, if any of the conditions set forth below under "—Conditions to the Exchange Offer" have not been satisfied or waived, to terminate the exchange offer by giving oral or written notice of the delay or termination to the exchange agent, or



(3)

to amend the terms of the exchange offer in any manner, by complying with Rule 14e-1(d) under the Exchange Act to the extent that rule applies. If we make any material amendment to the terms of the exchange offer or waive any material condition, we will keep the exchange offer open for at least five business days after we notify you of such change or waiver. If we make a material change to the terms of the exchange offer, it may be necessary for us to provide you with an amendment to this prospectus reflecting that change. We may only delay, terminate or amend the offer prior to its expiration.

        We acknowledge and undertake to comply with the provisions of Rule 14e-l(c) under the Exchange Act, which requires us to return the Restricted Notes surrendered for exchange promptly after the termination or withdrawal of the exchange offer. We will notify you as promptly as we can of any extension, termination or amendment.

Procedures for Tendering Restricted Notes

        The Restricted Notes were issued as global notes in fully registered form without interest coupons. Beneficial interests in the global notes held by direct or indirect participants in DTC are shown on, and transfers of these interests are effected only through, records maintained in book-entry form by DTC with respect to its participants. You may only tender your Restricted Notes by book-entry transfer of the Restricted Notes into the exchange agent's account at DTC. The tender to us of Restricted Notes by you, as set forth below, and our acceptance of the Restricted Notes will constitute a binding agreement between us and you, upon the terms and subject to the conditions set forth in this prospectus. Except as set forth below, to tender Restricted Notes for exchange pursuant to the exchange offer, you must transmit to Wilmington Trust FSB, as exchange agent, on or prior to the time of expiration either:

(1)

a written or facsimile copy of a properly completed and duly executed letter of transmittal for your Restricted Notes, including all other documents required by the letter of transmittal, to the exchange agent at the address set forth on the cover page of the letter of transmittal; or



(2)

a computer-generated message transmitted by means of DTC's Automated Tender Offer Program (ATOP) system and received by the exchange agent and forming a part of a confirmation of book-entry transfer, in which you acknowledge and agree to be bound by the terms of the letter of transmittal for your notes.

        In addition, the exchange agent must receive, on or prior to the expiration date:

(1)

a timely confirmation of book-entry transfer (a "book-entry confirmation") of the Restricted Notes into the exchange agent's account at DTC; or



(2)

you must comply with the guaranteed delivery procedures described below.

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        If you are a beneficial owner whose Restricted Notes are registered in the name of a broker, dealer, commercial bank, trust company or other nominee, and wish to tender, you should promptly instruct the registered holder to tender on your behalf. Any registered holder that is a participant in DTC's book-entry transfer facility system may make book-entry delivery of the Restricted Notes by causing DTC to transfer the Restricted Notes into the exchange agent's account. If you wish to tender on your own behalf, you must, prior to completing and executing the letter of transmittal for your Restricted Notes and delivering your Restricted Notes, either make appropriate arrangements to register ownership of the Restricted Notes in your name or obtain a properly completed bond power from the registered holder. The transfer of registered ownership may take considerable time.

        Signatures on a letter of transmittal or a notice of withdrawal must be guaranteed by an eligible institution unless:

•

Restricted Notes tendered in the exchange offer are tendered either



•

by a registered holder who has not completed the box entitled "Special Issuance Instructions" or "Special Delivery Instructions" on the letter of transmittal, or



•

for the account of an eligible institution; and



•

the box entitled "Special Registration Instructions" on the letter of transmittal has not been completed.

        If signatures on a letter of transmittal or a notice of withdrawal are required to be guaranteed, the guarantee must be by a financial institution, which includes most banks, savings and loan associations and brokerage houses, that is a participant in the Securities Transfer Agents Medallion Program, the New York Stock Exchange Medallion Program or the Stock Exchanges Medallion Program.

        If the letter of transmittal is signed by a person other than you, your Restricted Notes must be endorsed or accompanied by a properly completed bond power and signed by you as your name appears on those Restricted Notes.

        If the letter of transmittal or any Restricted Notes or bond powers are signed by trustees, executors, administrators, guardians, attorneys-in-fact, officers of corporations, or others acting in a fiduciary or representative capacity, those persons should so indicate when signing. Unless we waive this requirement, in this instance you must submit with the letter of transmittal proper evidence satisfactory to us of their authority to act on your behalf.

        We, in our sole discretion, will make a final and binding determination on all questions as to the validity, form, eligibility (including time of receipt) and acceptance of Restricted Notes tendered for exchange. We reserve the absolute right to reject any and all tenders not properly tendered or to not accept any tender which acceptance might, in our judgment or our counsel's, be unlawful. We also reserve the absolute right to waive any defects or irregularities or conditions of the exchange offer as to any individual tender before the expiration date (including the right to waive the ineligibility of any holder who seeks to tender Restricted Notes in the exchange offer). Our interpretation of the terms and conditions of the exchange offer as to any particular tender either before or after the expiration date will be final and binding on all parties. Unless waived, any defects or irregularities in connection with tenders of Restricted Notes for exchange must be cured within a reasonable period of time, as we determine. We are not, nor is the exchange agent or any other person, under any duty to notify you of any defect or irregularity with respect to your tender of Restricted Notes for exchange, and no one shall be liable for failing to provide such notification.

        By tendering Restricted Notes, you represent to us that: (i) the Exchange Notes to be issued to you in the exchange offer are acquired in the ordinary course of your business; (ii) at the time of the commencement of the exchange offer you have no arrangement or understanding with any person to participate in the distribution (within the meaning of the Securities Act) of the Exchange Notes to be

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issued to you in the exchange offer in violation of the Securities Act; (iii) you are not our affiliate, as defined in Rule 405 of the Securities Act, (iv) you are not engaging in, and do not intend to engage in, a distribution of the Exchange Notes to be issued to you in the exchange offer; (v) if you are a purchasing broker-dealer, that you will receive the Exchange Notes for your own account in exchange for the Restricted Notes that were acquired by you as a result of your market-making or other trading activities and that you will deliver a prospectus in connection with any resale of such Exchange Notes and (vi) you are not acting on behalf of any persons or entities who could not truthfully make the foregoing representations. For further information regarding resales of the Exchange Notes by participating broker-dealers, see the discussion under the caption "Plan of Distribution."

        If any holder or other person is an "affiliate" of ours, as defined under Rule 405 of the Securities Act, or is engaged in, or intends to engage in, or has an arrangement or understanding with any person to participate in, a distribution of the Exchange Notes, that holder or other person cannot rely on the applicable interpretations of the staff of the Commission, may not tender its Restricted Notes in the exchange offer and must comply with the registration and prospectus delivery requirements of the Securities Act in connection with any resale transaction.

        Each broker-dealer that receives Exchange Notes for its own account in exchange for Restricted Notes, where the Restricted Notes were acquired by it as a result of market-making activities or other trading activities, must acknowledge that it will deliver a prospectus that meets the requirements of the Securities Act in connection with any resale of the Exchange Notes. By so acknowledging and by delivering a prospectus, a broker-dealer will not be deemed to admit that it is an "underwriter" within the meaning of the Securities Act. See "Plan of Distribution."

        Furthermore, any broker-dealer that acquired any of its Restricted Notes directly from us:

•

may not rely on the applicable interpretation of the staff of the Commission's position contained in Exxon Capital Holdings Corp., SEC no-action letter (April 13, 1988), Morgan, Stanley & Co. Inc., SEC no-action letter (June 5, 1991) and Shearman & Sterling, SEC no-action letter (July 2, 1993);



•

must also be named as a selling securityholder in connection with the registration and prospectus delivery requirements of the Securities Act relating to any resale transaction.

        By delivering an agent's message, a beneficial owner (whose Restricted Notes are registered in the name of a broker, dealer, commercial bank, trust company or other nominee) or holder will be deemed to have irrevocably appointed the exchange agent as its agent and attorney-in-fact (with full knowledge that the exchange agent is also acting as an agent for us in connection with the exchange offer) with respect to the Restricted Notes, with full power of substitution (such power of attorney being deemed to be an irrevocable power coupled with an interest subject only to the right of withdrawal described in this prospectus), to receive for our account all benefits and otherwise exercise all rights of beneficial ownership of such Restricted Notes, in accordance with the terms and conditions of the exchange offer.

        Each beneficial owner or holder will also be deemed to have represented and warranted to us that it has authority to tender, exchange, sell, assign and transfer the Restricted Notes it tenders and that, when the same are accepted for exchange, we will acquire good, marketable and unencumbered title to such Restricted Notes, free and clear of all liens, restrictions, charges and encumbrances, and that the Restricted Notes tendered are not subject to any adverse claims or proxies. Each beneficial owner and holder, by tendering its Restricted Notes, also agrees that it will comply with its obligations under the registration rights agreement.

Acceptance of Restricted Notes for Exchange; Delivery of Exchange Notes

        Upon satisfaction or waiver of all of the conditions to the exchange offer, we will accept, promptly after the expiration date, all Restricted Notes properly tendered and will issue the Exchange Notes

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promptly after acceptance of the Restricted Notes. See "—Conditions to the Exchange Offer." For purposes of the exchange offer, we will be deemed to have accepted properly tendered Restricted Notes for exchange if and when we give oral (confirmed in writing) or written notice to the exchange agent.

        The holder of each Restricted Note accepted for exchange will receive an Exchange Note in the amount equal to the surrendered Restricted Note. Holders of Exchange Notes on the relevant record date for the first interest payment date following the consummation of the exchange offer will receive interest accruing from the most recent date to which interest has been paid on the Restricted Notes or, if no interest has been paid, from the issue date of the Restricted Notes. Holders of Exchange Notes will not receive any payment in respect of accrued interest on Restricted Notes otherwise payable on any interest payment date, the record date for which occurs on or after the consummation of the exchange offer.

        In all cases, issuance of Exchange Notes for Restricted Notes that are accepted for exchange will be made only after timely receipt by the exchange agent of an agent's message and a timely confirmation of book-entry transfer of the Restricted Notes into the exchange agent's account at DTC.

        If any tendered Restricted Notes are not accepted for any reason set forth in the terms and conditions of the exchange offer or if Restricted Notes are submitted for a greater principal amount than the holder desires to exchange, such unaccepted or non-exchanged Restricted Notes will be returned without expense to an account maintained with DTC promptly after the expiration or termination of the exchange offer.

Guaranteed Delivery Procedures

        If you desire to tender your Restricted Notes and your Restricted Notes are not immediately available, time will not permit your Restricted Notes or other required documents to reach the exchange agent before the time of expiration or you cannot complete the procedure for book-entry on a timely basis, you may tender if:

•

you tender through an eligible financial institution;



•

on or prior to 5:00 p.m., New York City time, on the expiration date, the exchange agent receives from an eligible institution, a written or facsimile copy of a properly completed and duly executed letter of transmittal and notice of guaranteed delivery, substantially in the form provided by us; and



•

a book-entry confirmation, and all other documents required by the letter of transmittal, are received by the exchange agent within three New York Stock Exchange trading days after the date of execution of the notice of guaranteed delivery.

        The notice of guaranteed delivery may be sent by facsimile transmission, mail or hand delivery. The notice of guaranteed delivery must set forth:

•

your name and address;



•

the amount of Restricted Notes you are tendering; and



•

a statement that your tender is being made by the notice of guaranteed delivery and that you guarantee that within three New York Stock Exchange trading days after the execution of the notice of guaranteed delivery, the eligible institution will deliver the following documents to the exchange agent:



•

a book-entry confirmation of tender;

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•

a written or facsimile copy of the letter of transmittal, or a book-entry confirmation instead of the letter of transmittal; and



•

any other documents required by the letter of transmittal.

Book-Entry Transfers

        The exchange agent will make a request to establish an account for the Restricted Notes at DTC for purposes of the exchange offer within two business days after the date of this prospectus. Any financial institution that is a participant in DTC's systems must make book-entry delivery of Restricted Notes by causing DTC to transfer those Restricted Notes into the exchange agent's account at DTC in accordance with DTC's procedures for transfer. This participant should transmit its acceptance to DTC on or prior to the expiration date. DTC will verify this acceptance, execute a book-entry transfer of the tendered Restricted Notes into the exchange agent's account at DTC and then send to the exchange agent confirmation of this book-entry transfer. The transmission of the Restricted Notes and agent's message to DTC and delivery by DTC to and receipt by the exchange agent of the related agent's message will be deemed to be a valid tender.

        If one of the following situations occurs:

•

you cannot deliver a book-entry confirmation of book-entry delivery of your book-entry interests into the relevant account of the exchange agent at DTC; or



•

you cannot deliver all other documents required by the letter of transmittal to the exchange agent prior to the time of expiration,

then you must tender your book-entry interests according to the guaranteed delivery procedures discussed above.

Withdrawal Rights

        For a withdrawal of a tender of Restricted Notes to be effective, the exchange agent must receive a valid withdrawal request through the Automated Tender Offer Program (ATOP) system from the tendering DTC participant before the expiration date. Any such request for withdrawal must include the VOI number of the tender to be withdrawn and the name of the ultimate beneficial owner of the related Restricted Notes in order that such notes may be withdrawn. Properly withdrawn Restricted Notes may be re-tendered by following the procedures described under "—Procedures for Tendering Restricted Notes" above at any time on or before 5:00 p.m., New York City time, on the expiration date.

        We will determine all questions as to the validity, form and eligibility, including time of receipt, of notices of withdrawal. Any Restricted Notes so withdrawn will be deemed not to have been validly tendered for exchange. No Exchange Notes will be issued unless the Restricted Notes so withdrawn are validly re-tendered.

Conditions to the Exchange Offer

        Notwithstanding any other provision of the exchange offer and subject to our obligations under the registration rights agreement, we will not be required to accept for exchange, or to issue Exchange Notes in exchange for, any Restricted Notes and may terminate or amend the exchange offer, if at any time before the acceptance of any Restricted Notes for exchange any of the following events occur:

•

the exchange offer violates applicable law or any applicable interpretation of the staff of the Commission;

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•

an action or proceeding has been instituted or threatened in any court or by any governmental agency that might materially impair our ability to proceed with the exchange offer and any material adverse development shall have occurred in any existing action or proceeding with respect to us; and



•

all governmental approvals have not been obtained, which approvals we deem necessary for the consummation of the exchange offer.

        These conditions are for our sole benefit and we may assert them regardless of the circumstances giving rise to them, subject to applicable law. We also may waive in whole or in part at any time and from time to time any particular condition in our sole discretion. If we waive a condition, we may be required in order to comply with applicable securities laws, to extend the expiration date of the exchange offer. Our failure at any time to exercise any of the foregoing rights will not be deemed a waiver of these rights and these rights will be deemed ongoing rights that may be asserted at any time (in the case of any condition involving governmental approvals necessary to the consummation of the exchange offer) and from time to time prior to the time of expiration (in the case of all other conditions).

        In addition, we will not accept for exchange any Restricted Notes tendered, and no Exchange Notes will be issued in exchange for any of those Restricted Notes, if at the time the notes are tendered any stop order is threatened by the Commission or in effect with respect to the registration statement of which this prospectus is a part or the qualification of the indenture under the Trust Indenture Act of 1939, as amended (the "Trust Indenture Act" or "TIA").

        The exchange offer is not conditioned on any minimum principal amount of Restricted Notes being tendered for exchange.

Exchange Agent

        We have appointed Wilmington Trust FSB as exchange agent for the exchange offer. Questions, requests for assistance and requests for additional copies of the prospectus, letter of transmittal and other related documents should be directed to the exchange agent addressed as follows:

By Mail, Hand or Overnight Delivery:

Wilmington Trust FSB
c/o Wilmington Trust Company
Corporate Capital Markets
Rodney Square North
1100 North Market Street
Wilmington, Delaware 19890-1626

By Facsimile:

(302) 636-4139

For Information or Confirmation by Telephone:

Sam Hamed
(302) 636-6181

        The exchange agent also acts as trustee under the indenture.

Fees and Expenses

        The principal solicitation is being made through DTC by Wilmington Trust FSB, as exchange agent. We will pay the exchange agent customary fees for its services, reimburse the exchange agent for

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its reasonable out-of-pocket expenses incurred in connection with the provision of these services and pay other registration expenses, including registration and filing fees, fees and expenses of compliance with federal securities and state blue sky securities laws, printing expenses, messenger and delivery services and telephone, fees and disbursements to our counsel, application and filing fees and any fees and disbursement to our independent registered public accounting firm. We will not make any payment to brokers, dealers or others soliciting acceptances of the exchange offer. We will pay the estimated cash expenses to be incurred in connection with the exchange offer.

        Additional solicitation may be made by telephone, facsimile or in person by our and our affiliates' officers and regular employees and by persons so engaged by the exchange agent.

Transfer Taxes

        You will not be obligated to pay any transfer taxes in connection with the tender of Restricted Notes in the exchange offer unless you instruct us to register Exchange Notes in the name of, or request that Restricted Notes not tendered or not accepted in the exchange offer be returned to, a person other than the registered tendering holder. In those cases, you will be responsible for the payment of any applicable transfer tax.

Accounting Treatment

        We will record the Exchange Notes at the same carrying value as the Restricted Notes, as reflected in our accounting records on the date of the exchange. Accordingly, we will not recognize any gain or loss for accounting purposes as the term of the Exchange Notes are substantially identical to those of the Restricted Notes. The expenses of the exchange offer will be amortized over the terms of the Exchange Notes.

Consequences of Failing to Exchange Restricted Notes

        If you do not exchange your Restricted Notes for Exchange Notes in the exchange offer or qualify to elect to have your Restricted Notes registered in a "shelf" registration form, your Restricted Notes will continue to be subject to the provisions of the indenture regarding transfer and exchange of the Restricted Notes and the restrictions on transfer of the Restricted Notes imposed by the Securities Act and state securities law. These transfer restrictions are required because the Restricted Notes were issued under an exemption from, or in a transaction not subject to, the registration requirements of the Securities Act and applicable state securities laws. In general, the Restricted Notes may not be offered or sold unless registered under the Securities Act, except under an exemption from, or in a transaction not subject to, the Securities Act and applicable state securities laws. We do not plan to register the Restricted Notes under the Securities Act.

        If you do not exchange your Restricted Notes for Exchange Notes in the exchange offer or qualify to elect to have your Restricted Notes registered in a "shelf" registration form, you will continue to be entitled to all the rights and limitations applicable to the Restricted Notes as set forth in the indenture, but we will not have any further obligation to you to provide for the exchange and registration of the Restricted Notes under the registration rights agreement other than as set forth above under "—Purpose and Effect." Therefore, the liquidity of the market for your Restricted Notes could be adversely affected upon completion of the exchange offer if you do not participate in the exchange offer.

Participating Broker-Dealers

        Each broker-dealer that receives Exchange Notes for its own account in exchange for Restricted Notes, where such Restricted Notes were acquired by such broker-dealer as a result of market-making activities or other trading activities, must acknowledge that it will deliver a prospectus in connection with any resale of such Exchange Notes. See "Plan of Distribution."

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BASIS OF FINANCIAL INFORMATION

        The term "Predecessor" refers to our predecessor company, BMSMI, formerly a division of BMS, and now known as Lantheus Medical Imaging, Inc. The term "Successor" refers to Lantheus MI Intermediate, Inc., our direct parent, and its subsidiaries. The financial statements included in this prospectus for BMSMI, as of and for the year ended December 31, 2007, have been prepared on a carve-out basis using BMS's historical bases in the assets and liabilities and the historical results of the operations of BMSMI. The financial statements have been derived from the consolidated financial statements and accounting records of BMS, principally from statements and records representing the business of BMSMI when operated as a division of BMS. These financial statements have been prepared in accordance with GAAP.

        The statement of operations for the year ended December 31, 2007 includes expense allocations for certain corporate functions historically provided to BMSMI by BMS, including general corporate expenses related to corporate functions such as executive oversight, risk management, information technology, accounting, audit, legal, investor relations, human resources, shared services and employee benefits and incentives, including pension and other post retirement benefits and stock-based compensation arrangements. Additionally, the statement of operations includes expense allocations relating to the effects of foreign currency derivatives.

        We considered these allocations to be a reasonable reflection of the utilization of services provided or benefits received. The allocations may not, however, reflect the expense BMSMI would have incurred as a stand-alone company, and the expense allocation methodologies used by BMS may not represent actual costs of operating the stand-alone business. Actual costs that may have been incurred if BMSMI had been a stand-alone company would depend on a number of factors, including the chosen organizational structure, what functions were outsourced or performed by employees and strategic decisions made in areas such as information technology systems and infrastructure.

        In addition, certain Predecessor items have been reclassified to conform with Successor's presentation.

        Therefore, the results of operations, changes in equity and cash flows for the Successor and Predecessor periods are not comparable. These statements have been prepared using the Predecessor's bases in the assets and liabilities and the historical results of operations for the year ended December 31, 2007. Periods subsequent to December 31, 2007 have been prepared using our bases in the assets and liabilities.

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NON-GAAP FINANCIAL MEASURES

        EBITDA and Adjusted EBITDA and the ratios related thereto, as presented in this prospectus, are supplemental measures of our performance that are not required by, or presented in accordance with, generally accepted accounting principles in the United States ("GAAP"). They are not measurements of our financial performance under GAAP and should not be considered as alternatives to net income or any other performance measures derived in accordance with GAAP or as alternatives to cash flow from operating activities as measures of our liquidity.

        Our measurement of EBITDA and Adjusted EBITDA and the ratios related thereto may not be comparable to similarly titled measures of other companies and are not measures of performance calculated in accordance with GAAP. We have included information concerning EBITDA and Adjusted EBITDA in this prospectus because we believe that such information is used by certain investors as one measure of a company's historical performance.

        EBITDA and Adjusted EBITDA have limitations as analytical tools, and you should not consider them in isolation, or as a substitute for analysis of our operating results or cash flows as reported under GAAP. Some of these limitations are:

•

they do not reflect our cash expenditures, or future requirements, for capital expenditures or contractual commitments;



•

they do not reflect changes in, or cash requirements for, our working capital needs;



•

they do not reflect the significant interest expense or the cash requirements necessary to service interest or principal payments, on our debt;



•

although depreciation is a non-cash charge, the assets being depreciated will often have to be replaced in the future, and EBITDA and Adjusted EBITDA do not reflect any cash requirements for such replacements;



•

they are not adjusted for all non-cash income or expense items that are reflected in our statements of cash flows; and



•

other companies in our industry may calculate these measures differently than we do, limiting their usefulness as comparative measures.

        Because of these limitations, EBITDA and Adjusted EBITDA should not be considered as measures of discretionary cash available to us to invest in the growth of our business. We compensate for these limitations by relying primarily on our GAAP results and using EBITDA and Adjusted EBITDA only for supplemental purposes. Please see the consolidated financial statements included elsewhere in this prospectus for our GAAP results.

        For a presentation of net income as calculated under GAAP and reconciliation to our calculation of EBITDA and Adjusted EBITDA, see "Summary—Summary Consolidated Financial Data" in this prospectus.

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USE OF PROCEEDS

        The exchange offer is intended to satisfy our obligations under the registration rights agreement. We will not receive any cash proceeds from the exchange offer. Accordingly, the issuance of the Exchange Notes will not result in any increase in our outstanding indebtedness or change in our capitalization.

RATIO OF EARNINGS TO FIXED CHARGES

        For purposes of calculating the ratio of earnings to fixed charges, earnings represents the sum of income before income taxes, fixed charges and amortization of capitalized interest, less capitalized interest. Fixed charges consist of interest expense, capitalized interest, amortization of deferred financing costs, write-off of deferred financing costs and the portion of rental expense which management believes is representative of the interest component of rent expense. Financial information for the year ended December 31, 2007 is presented on a carve-out basis, utilizing allocations which do not separately and distinctly identify fixed charges and, therefore, we have not presented the ratio of earnings to fixed charges for 2007.

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CAPITALIZATION

        The following table sets forth our cash and cash equivalents and our capitalization as of June 30, 2010. The following table should be read in conjunction with "Management's Discussion and Analysis of Financial Condition and Result of Operations" and our audited financial statements and notes thereto included in this prospectus.

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SELECTED CONSOLIDATED FINANCIAL DATA

        The following table sets forth (i) selected consolidated financial data for Lantheus Intermediate, our parent company and a guarantor of the notes (as "Successor"), for the six months ended June 30, 2009 and 2010, which have been derived from the unaudited consolidated financial statements of Lantheus Intermediate included elsewhere in this prospectus, (ii) certain selected consolidated financial data for Lantheus Intermediate, our parent company and a guarantor of the notes (as "Successor"), as of and for the fiscal years ended December 31, 2008 and 2009, which have been derived from the audited consolidated financial statements of Lantheus Intermediate included elsewhere in this prospectus and (iii) certain selected consolidated financial data for BMSMI (as "Predecessor," formerly a division of BMS and now known as Lantheus Medical Imaging, Inc.) for the year ended December 31, 2007, which have been derived from the audited financial statements of BMSMI included elsewhere in this prospectus. The financial statements of BMSMI as of and for the year ended December 31, 2007 were prepared in connection with Avista's acquisition of Lantheus on January 8, 2008 and contain expense allocations for corporate functions historically provided to BMSMI by BMS and not costs that we would have necessarily incurred as a stand-alone entity. These statements have been prepared using the Predecessor's bases in the assets and liabilities and the historical results of operations. As a result, the financial statements of BMSMI as of and for the year ended December 31, 2007 are not comparable to our financial statements for subsequent periods. See "Basis of Financial Information."

        The selected financial data as of and for the years ended December 31, 2005 and 2006 have been omitted. Such data are unknown and unavailable to us and would require the preparation of financial data for the predecessor on a carve-out basis. This preparation would require substantial management time and cannot be completed without the expenditure of unreasonable time, effort and expense. We believe the omission of this financial data does not have a material impact on the understanding of our results of operations, financial performance and related trends.

        The results indicated below and elsewhere in this prospectus are not necessarily indicative of our future performance. You should read this information together with "Capitalization," "Management's

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Discussion and Analysis of Financial Condition and Results of Operations" and the audited and unaudited consolidated financial statements and related notes included elsewhere in this prospectus.

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MANAGEMENT'S DISCUSSION AND ANALYSIS OF
FINANCIAL CONDITION AND RESULTS OF OPERATIONS

        You should read the following discussion and analysis of our results of operations and financial statements in conjunction with the consolidated financial statements, the accompanying notes and the other financial information included in this prospectus. This section contains forward looking statements that involve risks and uncertainties. Our actual results may vary materially from those discussed in the forward looking statements as a result of various factors, including, without limitation, those set forth in "Risk Factors," as well as other matters described in this prospectus. Actual results may differ materially from those contained in the forward looking statements. See "Cautionary Note Regarding Forward Looking Statements."

Overview

        We are a leading specialty pharmaceutical company that develops, manufactures, distributes and sells innovative diagnostic medical imaging products on a global basis. Our current imaging agents primarily assist in the diagnosis of heart, vascular and other diseases using nuclear imaging, ultrasound and MRI technologies. We also have a full clinical and preclinical development program of next-generation and first-in-class products that use PET and MRI technologies. We believe that our products offer significant benefits to patients, healthcare providers and the overall healthcare system. As a result of more accurate diagnosis of disease, we believe our products allow healthcare providers to make more informed patient care decisions, potentially improving outcomes, reducing patient risk and decreasing costs for payors and the entire healthcare system.

        We have operations in the United States, Puerto Rico, Canada and Australia and distribution relationships in Europe, Asia Pacific and Latin America. Our products are used by nuclear physicians, cardiologists, radiologists, internal medicine physicians, technologists and sonographers working in a variety of clinical settings and we sell our products to radiopharmacies, hospitals, clinics, group practices, integrated delivery networks, group purchasing organizations and, in certain circumstances, wholesalers.

Our Products

        Our principal products include DEFINITY, an ultrasound contrast agent, Cardiolite, a myocardial perfusion imaging agent, and TechneLite, a generator used to provide the radioisotope to radiolabel Cardiolite and other radiopharmaceuticals. In the United States, DEFINITY, Cardiolite and TechneLite are marketed through an internal sales force and sold either to radiopharmacies or directly to end-users. Radiopharmacies reconstitute certain of the products into patient specific unit-dose syringes which are then sold directly to hospitals, clinics and group practices. Internationally, in some countries these products are marketed through an internal sales force and sold either through our radiopharmacies or directly to end-users, and in other countries through distributors. DEFINITY, Cardiolite and TechneLite, in the aggregate, accounted for approximately 71% and 81% of our global revenues during the six months ended June 30, 2010 and 2009, respectively and approximately 76% of our global total revenues in 2009.

        DEFINITY is the leading ultrasound contrast agent used in ultrasound exams of the heart, also known as echocardiography exams. DEFINITY consists of gas-filled micro-bubbles, and is indicated in the United States for use in patients with suboptimal echocardiograms to assist in the imaging of the left ventricular chamber and left endocardial border of the heart in ultrasound procedures. We launched DEFINITY in 2001, with market exclusivity currently until the end of 2016. During the six months ended June 30, 2010 and June 30, 2009, DEFINITY generated net revenues of $29.1 million and $18.7 million, respectively, and DEFINITY accounted for approximately 18% and 9% of our net revenues, respectively. For the year ended December 31, 2009, DEFINITY generated net revenues of $42.9 million, and DEFINITY accounted for approximately 9%, 4% and 12% of our net revenues in 2007, 2008 and 2009, respectively.

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        Cardiolite is the leading technetium-based radiopharmaceutical used in SPECT MPI procedures. Cardiolite is primarily used for detecting coronary artery disease. Cardiolite was approved by the FDA in 1990, and its market exclusivity expired in July 2008. During the six months ended June 30, 2010 and June 30, 2009, Cardiolite generated net revenues of $38.5 million and $71.2 million, respectively, and Cardiolite accounted for approximately 24% and 35% of our net revenues, respectively. For the year ended December 31, 2009, Cardiolite generated total revenues of $119.3 million, and Cardiolite accounted for approximately 64%, 60% and 33% of our total revenues in 2007, 2008 and 2009.

        TechneLite is a technetium-based generator which provides the essential nuclear material used by radiopharmacies to radiolabel Cardiolite and other technetium-based radiopharmaceuticals used in nuclear medicine procedures. TechneLite uses Moly as its main active ingredient. During the six months ended June 30, 2010 and June 30, 2009, TechneLite generated net revenues of $47.1 million and $73.6 million, respectively, and accounted for approximately 29% and 37% of our net revenues, respectively. For the year ended December 31, 2009, TechneLite generated net revenues of $112.9 million and accounted for approximately 17%, 23% and 31% of our net revenues in 2007, 2008 and 2009, respectively.

        In April 2009, in order to continue to diversify our product portfolio, we purchased the U.S., Canadian and Australian rights to an MRA agent, now known as Ablavar, from EPIX Pharmaceuticals, Inc., and in June 2010, we acquired the remaining rest of world rights to Ablavar. Ablavar was approved by the FDA to evaluate aortoiliac occlusive disease in adults with known or suspected peripheral vascular disease. We paid an aggregate purchase price of approximately $32.8 million, which consisted of $28.2 million in patents, $500,000 in manufacturing know-how acquired from a different party, and $4.1 million in inventory. In the third quarter of 2009, we hired and trained a contract sales force and a medical liaison staff to prepare for the launch of Ablavar. In January 2010, we formally launched Ablavar in the United States and expect that this launch will enable us to capitalize on the current usage of MRA contrast agents in MRA procedures and the overall growing trends within the diagnostic medical imaging industry. The revenue recognized relating to Ablavar for the first six months of 2010 was not material to our financial statements.

        In 2009 and 2008, we experienced a reduction in gross profit of approximately $117.0 million and $113.2 million, respectively. The primary factor contributing to this decrease is a shift in product sales mix and a decrease in pricing related to our higher margin products in 2009, as compared to 2008, and in 2008, as compared to 2007. The decrease in 2009, as compared to 2008, was primarily due to a decrease in our higher margin product Cardiolite and the decrease in 2008, as compared to 2007, was primarily due to a decrease in our higher margin products Cardiolite and DEFINITY, which was offset, in part, by an increase in our lower margin product TechneLite. As discussed below, the reduction in sales related to Cardiolite in 2009 and 2008 was due primarily to the expiration of Cardiolite's market exclusivity, which expired in July 2008, and the introduction of generic competition, which began in September 2008. The reduction in sales in 2008, as compared to 2007, also related to DEFINITY, the sales of which were negatively impacted by the addition of a boxed warning in late 2007. Our gross profit margin for 2009, as compared to 2008, was also positively impacted by an $8.2 million inventory revaluation recorded in 2008 as a result of our acquisition from BMS and $32.8 million of additional intangible amortization recorded in 2008 primarily related to the expiration of Cardiolite's market exclusivity in 2008 after which amortization ceased. In addition, our gross profit margins decreased by 28% in 2008, as compared to 2007, which was also negatively impacted by the inventory revaluation recorded in 2008 and an increase in sales related to our lower margin product TechneLite.

Key Factors Affecting Our Results

DEFINITY Boxed Warning

        In October 2007, the FDA requested that all of the manufacturers of ultrasound contrast agents add a boxed warning to their products to notify physicians and patients about potentially serious safety

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concerns or risks posed by the products. As a result of the boxed warning, unit sales of DEFINITY decreased substantially in late 2007 and early 2008. In May 2008, the boxed warning was modified by the FDA in response to the efforts of prescribing physicians. Since the re-launch of DEFINITY in June 2008, sales of DEFINITY have continued to increase quarter over quarter. As we better educate the physician and healthcare provider community about the benefits and risks of this product, we believe we will experience further penetration of suboptimal echocardiograms.

Cardiolite Competitive Position

        Cardiolite's market exclusivity expired in July 2008. In September 2008, the first of several competing generic products to Cardiolite was launched, and while we have faced significant pricing pressure, management believes our share of the MPI segment decreased from approximately one half to approximately one third of the entire segment from 2008 through the end of the second quarter of 2010. This is in comparison to many drugs which see a greater than 50% share erosion in the first several months after exclusivity expires. We believe that Cardiolite has been able to retain substantial share and its leadership position because of the brand awareness, appreciation of the agent's safety and efficacy profile, loyalty to the agent within the cardiology community, and our strong relationships with our distribution partners. In addition, Cardiolite has been able to retain its leadership position in the face of an overall moderate decline in the MPI segment due to a change in professional society appropriateness guidelines, on-going reimbursement pressures, the limited availability of Moly during the recent reactor shutdowns and the increase in Thallium doses and use of other diagnostic modalities as a result of a temporary shift to more available imaging agents and modalities. In the latter case, given the superior safety and efficacy profile of technetium generator-based MPI agents, with the major global Moly producers now operating again, we believe that there will be an increase in orders for Cardiolite from our Cardiolite channel partners.

Global Moly Supply Challenge

        Our TechneLite product uses Moly as its main active ingredient. Historically, our largest supplier of Moly has been MDS Nordion which has relied on the NRU reactor in Chalk River, Ontario. This reactor was off-line from May 2009 until August 2010 due to a "heavy water" leak in the reactor vessel. We have taken several steps in response to the global Moly shortage, including expanding sourcing from South Africa and Belgium, and pursuing additional global solutions. We recently entered into an agreement with NTP to supply us with Moly from the SAFARI reactor in South Africa. NTP, in turn, has partnered with IRE to co-supply us from the Belgian BR2 reactor. IRE also processes raw Moly from several other smaller European reactors. We are also pursuing additional sources of Moly from potential new producers around the world to further augment our current supply. In addition, we are exploring a number of alternative Moly projects with existing reactors and technologies as well as new technologies.

        With the general instability in the global supply of Moly and recent supply shortages, we have faced substantial increases in the cost of Moly in comparison to historical costs. We attempt to pass these Moly cost increases on to our customers in our customer contracts. Additionally, the instability in the global supply of Moly has resulted in Moly producers requiring, in exchange for fixed Moly prices, supply minimums in the form of take-or-pay obligations. The Moly supply shortage also had an incremental negative effect on the use of other technetium generator based diagnostic imaging agents, including Cardiolite. With less Moly, we manufactured fewer generators for radiopharmacies and hospitals to make up unit doses of Cardiolite, resulting in decreased share of Cardiolite in favor of Thallium, an older medical isotope that does not require Moly, and other diagnostic modalities. However, with the return to service of the NRU reactor, we believe that Cardiolite sales will benefit. See "Risk Factors—Our dependence upon third parties for the manufacture and supply of a substantial portion of our products could prevent us from delivering our products to our customers in the required

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quantities, within the required timeframe, or at all, which could result in order cancellations and decreased revenues."

Comparability of Annual Financial Statements

        The financial statements included in this prospectus for BMSMI, as of and for the year ended December 31, 2007, have been prepared on a carve-out basis using BMS's historical bases in the assets and liabilities and the historical results of the operations of BMSMI. The financial statements have been derived from the consolidated financial statements and accounting records of BMS, principally from statements and records representing the business of BMSMI when operated as a division of BMS. These financial statements have been prepared in accordance with GAAP.

        The statement of operations includes expense allocations for certain corporate functions historically provided to BMSMI by BMS, including general corporate expenses related to corporate functions such as executive oversight, risk management, information technology, accounting, audit, legal, investor relations, human resources, shared services and employee benefits and incentives, including pension and other post retirement benefits and stock-based compensation arrangements. Additionally, the statement of operations includes expense allocations relating to the effects of foreign currency derivatives.

        We considered these allocations to be a reasonable reflection of the utilization of services provided or benefits received. The allocations may not, however, reflect the expense BMSMI would have incurred as a stand-alone company, and the expense allocation methodologies used by BMS may not represent actual costs of operating the stand-alone business. Actual costs that may have been incurred if BMSMI had been a stand-alone company would depend on a number of factors, including the chosen organizational structure, what functions were outsourced or performed by employees and strategic decisions made in areas such as information technology systems and infrastructure.

        Therefore, the results of operations, changes in equity and cash flows for the Successor and Predecessor periods are not comparable. These statements have been prepared using the Predecessor's bases in the assets and liabilities and the historical results of operations for the year ended December 31, 2007. Periods subsequent to December 31, 2007 have been prepared using our bases in the assets and liabilities.

        For the purpose of convenience, we have assumed an effective date of January 1, 2008 for the acquisition. We determined the results of operations between the effective date and the acquisition date are not material and these results have been included with our results of operations. In the accompanying consolidated statements of income, we included net revenues of approximately $12.0 million, gross profit of approximately $8.3 million, operating income of approximately $5.4 million and net income of $3.3 million relating to the period from January 1, 2008 through January 7, 2008. The net income effect of this period of $3.3 million has been included as non-cash earnings within operating activities on the consolidated statement of cash flows and as goodwill on the consolidated balance sheet.

Trends and Outlook

        The following have negatively impacted our results in the six months ended June 30, 2010:

•

The combination of the global Moly supply shortage affecting our ability to supply TechneLite generators to the market;



•

continued Cardiolite generic competition;



•

DEFINITY's reduced level of sales as a result of the boxed warning and subsequent re-launch; and



•

limited Ablavar revenues to offset costs related to the launch of the product and the hiring of our contract sales force and medical liaisons.

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        Following the launch of Ablavar and further education of its benefits, we anticipate, as a result of our efforts, that market acceptance of the product will increase in the future.

        For the remainder of 2010, we expect that these challenges will be partially mitigated as a result of the expected continued increase in DEFINITY sales, anticipated continued leadership position of Cardiolite and the anticipated return of a normalized and sustained Moly supply.

Description of Key Line Items

Revenues

        The majority of our revenue is derived from product revenue. Product revenue can be affected by changes in raw material availability, customer demand and competitive pressures in the market. Product pricing is reduced upon entrance of generic competition to the marketplace, offset by decreases in rebates and discounts as brand name sales are replaced by generic. Other revenue represents contract manufacturing performed with respect to one product for one customer. The related costs are included in cost of goods sold.

Cost of Goods Sold

        Cost of goods sold consists of manufacturing, distribution and other costs related to our commercial products. In addition, it includes reserves established for excess or obsolete inventory. Most of our manufacturing and distribution costs are internal costs which include salaries and expenses related to managing our manufacturing, supply chain and quality assurance. Certain raw material costs and volumes are subject to product availability and variable pricing, which can have an impact on the total cost of our products in any given period. The cost of Moly was historically purchased through contractual pricing arrangements with a sole supplier. The sources of this raw material have since been diversified, which has resulted in variable pricing. With the general instability in the global supply of Moly and recent supply shortages, we have also faced increases in the cost of Moly in comparison to our historical costs. We attempt to pass these Moly cost increases on to our customers in our customer contracts.

Research and Development Expenses

        Research and development expenses consist of costs incurred in identifying, developing and testing product candidates. These expenses consist primarily of salaries and related expenses for personnel, fees paid to professional service providers for monitoring and analyzing clinical trials, regulatory costs, including user fees paid to the FDA, costs related to the development of our approved products, costs of contract research and manufacturing and the cost of facilities. In addition, research and development expenses include the cost of our medical affairs and medical information functions, which educate physicians on the scientific aspects of our commercial products and the approved indications, labeling and the costs of monitoring adverse events. After FDA approval of a product candidate, we record manufacturing expenses associated with a product as cost of goods sold rather than as research and development expenses. We expense research and development costs and patent related costs as they are incurred. Because of our ability to utilize resources across several projects, many of our research and development costs are not tied to any particular project and are allocated among multiple projects. We record direct costs on a project-by-project basis. We record indirect costs in the aggregate in support of all research and development. Development costs for clinical stage programs such as Flurpiridaz F18 tend to be higher than earlier stage programs such as our BMS 753951 program because of the costs associated with conducting late stage clinical trials and supporting manufacturing infrastructure.

        We expect that research and development expenses relating to our portfolio will fluctuate depending primarily on the timing and outcomes of clinical trials, related manufacturing initiatives and the results of our decisions based on these outcomes. We expect to incur additional expenses over the next several years for clinical trials related to our product development candidates, including

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Flurpiridaz F18,¹⁸F LMI1195 and BMS 753951. We also expect manufacturing expenses for some programs included in research and development expenses to increase as we support our manufacturing infrastructure for later stages of clinical development.

Sales and Marketing Expenses

        Sales and marketing expenses consist primarily of salaries and other related costs for personnel in sales, marketing and business development and our sales operations functions, as well as other costs related to our commercial products. We also incurred sales, marketing and other related costs in the third and fourth quarter of 2009 associated with our launch of Ablavar. In the third quarter of 2009, we hired and trained a contract sales force and a medical liaison staff to prepare for the launch of Ablavar. Other costs included in sales and marketing expenses include sales and marketing costs related to our co-promotion and marketing agreement, cost of product samples, promotional materials, market research and sales meetings. We expect to continue to incur sales and marketing costs associated with enhancing our sales and marketing functions and maintaining our sales force to support our commercial products.

General and Administrative Expenses

        General and administrative expenses consist primarily of salaries and other related costs for personnel in executive, finance, accounting, legal, information technology and human resource functions. Other costs included in general and administrative expenses include certain facility and insurance costs, including director and officer liability insurance, as well as professional fees for legal, consulting and accounting services.

Critical Accounting Policies

        The discussion and analysis of our financial condition and results of operations are based on our condensed consolidated financial statements, which have been prepared in accordance with GAAP. These financial statements requires us to make estimates and judgments that affect our reported assets and liabilities, revenues and expenses, and other financial information. Actual results may differ materially from these estimates under different assumptions and conditions. In addition, our reported financial condition and results of operations could vary due to a change in the application of a particular accounting standard.

        We regard an accounting estimate or assumption underlying our financial statements as a "critical accounting estimate" where:

•

the nature of the estimate or assumption is material due to the level of subjectivity and judgment necessary;



•

to account for highly uncertain matters or the susceptibility of such matters to change; and



•

the impact of the estimates and assumptions on financial condition or operating performance is material.

        We believe that our accounting policies and the related estimates relating to revenue recognition, inventory, goodwill, intangibles and long-lived assets, stock-based compensation and income taxes described below reflect the more significant judgments and estimates used in the preparations of our financial statements and therefore consider these to be "critical accounting policies."

Revenue Recognition

        We recognize revenue when evidence of an arrangement exists, title has passed, substantially all the risks and rewards of ownership have transferred to the customer, the selling price is fixed or determinable and collectibility is reasonably assured. For transactions for which revenue recognition criteria have not yet been met, the respective amounts are recorded as deferred revenue until such point in time when criteria are met and revenue can be recognized. Revenue is recognized net of

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reserves, which consist of allowances for returns, sales rebates and chargebacks. The estimates of these allowances are based on historical sales volumes and mix and require assumptions and judgements to be made in order to make such estimates. In the event that the sales mix is different from our estimates, we may be required to pay higher or lower total price adjustments and/or chargebacks than we previously estimated. Any changes to these estimates are recorded in the current period. In 2010 and 2009, these changes in estimates were not material to our results.

        Revenue arrangements with multiple elements are divided into separate units of accounting if certain criteria are met, including whether the delivered element has stand-alone value to the customer and whether there is objective and reliable evidence of the fair value of the undelivered items. Supply or service transactions may involve the charge of a nonrefundable initial fee with subsequent periodic payments for future products or services. The up-front fees, even if nonrefundable, are earned as the products and/or services are delivered and performed over the term of the arrangement.

Inventory

        Inventories include material, direct labor and related manufacturing overhead, and are stated at the lower of cost or market determined on a first-in, first-out basis. We assess the recoverability of inventory to determine whether adjustments for impairment are required. Inventory that is in excess of future requirements is written down to its estimated net realizable value based upon estimates of forecasted demand for our products. The estimates of demand require assumptions to be made of future operating performance and customer demand. If actual demand is less favorable than what has been forecasted by management, additional inventory impairments may be required. Our inventory balance was $28.6 million, $19.6 million and $13.9 million, net of a reserve for excess and obsolete inventory of $3.7 million, $3.6 million, and $1.5 million, as of June 30, 2010, December 31, 2009 and 2008, respectively. The increase in the reserve was due primarily to excess TechneLite accessories which reached expiration prior to use as a result of the NRU reactor delay, offset by utilization of reserves as such materials were scrapped.

        At June 30, 2010 and December 31, 2009 the inventory balances reflect approximately $9.3 million and $6.0 million, respectively, of finished products and materials related to Ablavar which was a product that was commercially launched in January 2010. We entered into an agreement with a supplier to provide Active Pharmaceutical Ingredient ("API") and finished products for Ablavar under which we are required to purchase quarterly minimum quantities ranging from $6.3 million to $7.5 million of API inventory through 2012. The supply agreement is designed to meet the expected demand of the product. In addition to the minimum commitment, we, at our discretion, can manufacture API into finished product for an additional charge per vial. We record the inventory when we take delivery, at which time we assume title and risk of loss. We include within current assets the amount of inventory that will be utilized within twelve months. Inventory that will be utilized after twelve months is included in non-current assets. At June 30, 2010, approximately $7.2 million of inventory was included in other non-current assets.

        As noted above, Ablavar, an MRA agent, was commercially launched in January 2010. We are currently in the process of educating radiologists on optimizing the use of the product within their patient populations. The revenues for this product through June 30, 2010 have not been significant. Based on the expected market penetration and management's estimates of projected sales, coupled with the potential aggregate six-year shelf life of the finished product and the API, we believe that we will be able to use our committed supply. In the event that we do not meet our sales expectations for Ablavar or cannot sell the product we are committed to purchase prior to its expiration, we would incur inventory losses and/or losses on our purchase commitments.

Goodwill, Intangibles and Long-Lived Assets

        Goodwill is not amortized but the carrying value is reviewed annually for impairment at October 31 as well as whenever events or changes in circumstances suggest that the carrying amount

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may not be recoverable. Our impairment measurement is performed by first comparing the fair value of the business to the carrying value. If the fair value is less, then a second step is performed to derive the implied fair value, which requires significant judgement and assumption, of the goodwill. Our estimate of the fair value will depend on our estimates of the future cash flows of the business, as well as utilization of the market valuation approach through comparison of similar companies with comparable business factors such as size, growth and profitability by assessing revenue and operating income multiples. A combination of the two methods is utilized to derive the fair value of the business in order to decrease the inherent risk associated with each model if used independently. If the fair value were to decline, then we may be required to incur material charges relating to the impairment of those assets. We have not incurred any goodwill impairment charges to date.

        We perform impairment testing for intangible and long-lived assets whenever events or changes in circumstances suggest that the carrying value of an asset or group of assets may not be recoverable. We measure the recoverability of assets to be held and used by comparing the carrying amount of the asset to future undiscounted net cash flows expected to be generated by the asset. If such assets are considered to be impaired, the impairment equals the amount by which the carrying amount of the assets exceeds the fair value of the assets. Any impairments are recorded as permanent reductions in the carrying amount of the assets.

        We completed our required annual impairment test as of the fourth quarter of 2009 and 2008 and determined that at each of those periods the carrying amount of goodwill was not impaired. In each year, our fair value, which includes goodwill, was substantially in excess of our carrying value.

Accounting for Stock-Based Compensation

        Our employees are eligible to receive awards from the Lantheus MI Holdings, Inc. 2008 Equity Incentive Plan. Our stock-based compensation cost is measured at the grant date based on the fair value of the award and is recognized as expense over the requisite service period, which generally represents the vesting period, and includes an estimate of the awards that will be forfeited. We use the Black-Scholes valuation model for estimating the fair value on the date of grant of stock options. The fair value of stock option awards is affected by the valuation assumptions, including the volatility of market participants, expected term of the option, risk-free interest rate and expected dividends as well as the estimated fair value of the Holdings common stock. The fair value of the Holdings common stock is determined by the Holdings board of directors at each award date. Any material change to the assumptions used in estimating the fair value of the options could have a material impact on our results of operations. When a contingent cash settlement of vested options becomes probable, we reclassify the vested awards to a liability and account for any incremental compensation cost in the period in which the settlement becomes probable.

Income Taxes

        The provision for income taxes has been determined using the asset and liability approach of accounting for income taxes. The provision for income taxes represents income taxes paid or payable for the current year plus the change in deferred taxes during the year. Deferred taxes result from differences between the financial and tax bases of our assets and liabilities. Deferred tax assets and liabilities are measured using the currently enacted tax rates that apply to taxable income in effect for the years in which those tax attributes are expected to be recovered or paid, and are adjusted for changes in tax rates and tax laws when changes are enacted.

        Valuation allowances are recorded to reduce deferred tax assets when it is more likely than not that a tax benefit will not be realized. The assessment of whether or not a valuation allowance is required often requires significant judgment, including the long-range forecast of future taxable income and the evaluation of tax planning initiatives. Adjustments to the deferred tax valuation allowances are made to earnings in the period when such assessments are made.

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        We account for uncertain tax positions using a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. Differences between tax positions taken in a tax return and amounts recognized in the financial statements are recorded as adjustments to income taxes payable or receivable, or adjustments to deferred taxes, or both. We classify interest and penalties within the provision for income taxes.

        We have a tax indemnification agreement with BMS related to certain contingent tax obligations arising prior to the acquisition of the business from BMS. The tax obligations are recognized in liabilities and the tax indemnification receivable is recognized within other noncurrent assets. The changes in the tax indemnification asset are recognized within other income, net in the statement of income, and the changes in the related liabilities are recorded within the tax provision. Accordingly, as these reserves change, adjustments are included in the tax provision while the offsetting adjustment is included in other income. Assuming that the receivable from BMS continues to be considered recoverable by us, there is no net effect on earnings related to these liabilities and no net cash outflows.

        The calculation of our tax liabilities involves certain estimates, assumptions and the application of complex tax regulations in numerous jurisdictions worldwide. Any material change in our estimates or assumptions, or the tax regulations, may have a material impact on our results of operations.

Results of Operations

Comparison of the Six Months Ended June 30, 2010 and 2009

        The following table sets forth certain consolidated statements of income data and information for the periods indicated:

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