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Impax Laboratories And ThoRx Laboratories Confirm Patent Challenge Relating To Generic OPANA® ER 5 Mg, 7.5 Mg, 10 Mg, 15 Mg, 20 Mg, 30 Mg, And 40 Mg

Impax Laboratories, Inc. (NASDAQ: IPXL) and its wholly owned subsidiary, ThoRx Laboratories, Inc., today confirm that they have initiated a challenge of the patents listed in the Orange Book in connection with Opana® ER (oxymorphone hydrochloride extended-release tablets, 5 mg, 7.5 mg, 10 mg, 15 mg, 20 mg, 30 mg, and 40 mg).

ThoRx filed its Abbreviated New Drug Application (ANDA) containing a paragraph IV certification for a generic version of Opana® ER with the U.S. Food & Drug Administration (FDA). Following receipt of the notice from FDA that ThoRx’s ANDA had been accepted for filing, ThoRx notified the New Drug Application holder and patent owner of its paragraph IV certification.

On November 14, 2012, Endo Pharmaceuticals Inc. and Grunenthal GMBH filed suit for patent infringement against ThoRx Laboratories, Inc. and Impax Laboratories, Inc. in the United States District Court for the Southern District of New York. This action formally initiates the patent challenge process under the Hatch-Waxman Act.

Once the ANDA is approved by FDA, Global Pharmaceuticals, Impax’s generic division, intends to commercialize the product.

Opana® ER is indicated for the relief of moderate to severe pain in patients requiring continuous around-the-clock opioid treatment for an extended period of time. According to Wolters Kluwer Health, U.S. sales of Opana® ER were approximately $90 million for the three-month period ending September 2012.

About Impax Laboratories, Inc.

Impax Laboratories, Inc. (“Impax”) is a technology based specialty pharmaceutical company applying its formulation expertise and drug delivery technology to the development of controlled-release and specialty generics in addition to the development of branded products. Impax markets its generic products through its Global Pharmaceuticals division and markets its branded products through the Impax Pharmaceuticals division. Additionally, where strategically appropriate, Impax has developed marketing partnerships to fully leverage its technology platform. Impax Laboratories is headquartered in Hayward, California, and has a full range of capabilities in its Hayward, Philadelphia and Taiwan facilities. For more information, please visit the Company's Web site at: www.impaxlabs.com.

" Safe Harbor" statement under the Private Securities Litigation Reform Act of 1995:

To the extent any statements made in this news release contain information that is not historical, these statements are forward-looking in nature and express the beliefs and expectations of management. Such statements are based on current expectations and involve a number of known and unknown risks and uncertainties that could cause the Company’s future results, performance or achievements to differ significantly from the results, performance or achievements expressed or implied by such forward-looking statements. Such risks and uncertainties include, but are not limited to, the effect of current economic conditions on the Company’s industry, business, financial position and results of operations, fluctuations in the Company’s revenues and operating income, the Company’s ability to successfully develop and commercialize pharmaceutical products, reductions or loss of business with any significant customer, the impact of consolidation of the Company’s customer base, the impact of competition, the Company’s ability to sustain profitability and positive cash flows, any delays or unanticipated expenses in connection with the operation of the Company’s Taiwan facility, the effect of foreign economic, political, legal and other risks on the Company’s operations abroad, the uncertainty of patent litigation, increased government scrutiny on the Company’s agreements with brand pharmaceutical companies, consumer acceptance and demand for new pharmaceutical products, the difficulty of predicting Food and Drug Administration filings and approvals, the Company’s inexperience in conducting clinical trials and submitting new drug applications, the Company’s ability to successfully conduct clinical trials, the Company’s reliance on third parties to conduct clinical trials and testing, the availability of raw materials and impact of interruptions in the Company’s supply chain, the use of controlled substances in the Company’s products, disruptions or failures in the Company’s information technology systems and network infrastructure, the Company’s reliance on alliance and collaboration agreements, the Company’s dependence on certain employees, the Company’s ability to comply with legal and regulatory requirements governing the healthcare industry, the regulatory environment, the Company’s ability to protect the Company’s intellectual property, exposure to product liability claims, changes in tax regulations, the Company’s ability to manage the Company’s growth, including through potential acquisitions, the restrictions imposed by the Company’s credit facility, uncertainties involved in the preparation of the Company’s financial statements, the Company’s ability to maintain an effective system of internal control over financial reporting, any manufacturing difficulties or delays, the effect of terrorist attacks on the Company’s business, the location of the Company’s manufacturing and research and development facilities near earthquake fault lines and other risks described in the Company’s periodic reports filed with the Securities and Exchange Commission. Forward-looking statements speak only as to the date on which they are made, and Impax undertakes no obligation to update publicly or revise any forward-looking statement, regardless of whether new information becomes available, future developments occur or otherwise.

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