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IMPAX Comments on Lawsuit Related to Generic Version of Detrol LA

HAYWARD, Calif.--(BUSINESS WIRE)--Mar 6, 2008 - IMPAX Laboratories, Inc. (OTC:IPXL) today announced that Pfizer Inc., Pharmacia & Upjohn Co. LLC, and Pfizer Health AB (collectively "Pfizer") have filed a lawsuit against the Company in the United States District Court for the Southern District of New York alleging patent infringement related to IMPAX's filing of an Abbreviated New Drug Application (ANDA) for generic versions of Detrol LA(R) 2mg and 4mg capsules. IMPAX's ANDA submission includes a Paragraph IV certification stating the Company believes its product does not infringe Pfizer's listed patents or that the listed patents are invalid or unenforceable.

Pfizer markets Detrol LA for the treatment of overactive bladder and urinary incontinence. According to Wolters Kluwer Health, U.S. sales of Detrol LA capsules were approximately $857 million in the 12 months ended January 31, 2008.

"This suit is just a delaying tactic to prevent patients from accessing generic drugs sooner," commented Larry Hsu, Ph.D., president and chief executive officer of IMPAX Laboratories. "We believe that it is without merit and we will vigorously defend our ANDA."

About IMPAX Laboratories, Inc.

IMPAX Laboratories, Inc. 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 and Philadelphia 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 IMPAX'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, possible adverse effects resulting from the delisting of and suspension of trading in IMPAX's stock, the SEC proceeding to determine whether to suspend or revoke the registration of IMPAX's securities under section 12 of the Securities Exchange Act, IMPAX's delay in filing its 2004 Form 10-K, its Form 10-Q for each of the first three quarters of 2005, 2006, and 2007, its Form 10-K for 2005 and 2006, the actual time that will be required to complete the filing of IMPAX's delinquent periodic reports, IMPAX's ability to obtain sufficient capital to fund its operations, the difficulty of predicting FDA filings and approvals, consumer acceptance and demand for new pharmaceutical products, the impact of competitive products and pricing, IMPAX's ability to successfully develop and commercialize pharmaceutical products, IMPAX's reliance on key strategic alliances, the uncertainty of patent litigation, the availability of raw materials, the regulatory environment, dependence on patent and other protection for innovative products, exposure to product liability claims, fluctuations in operating results and other risks detailed from time to time in IMPAX's filings 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.

Contact

IMPAX Laboratories, Inc.
Larry Hsu, Ph.D., President & CEO
510-476-2000, x1111
or
Arthur Koch, CFO
215-933-0351
www.impaxlabs.com
or
Investor Relations Contacts:
Lippert/Heilshorn & Associates, Inc.
Kim Sutton Golodetz, 212-838-3777
kgolodetz@lhai.com
or
Bruce Voss, 310-691-7100
bvoss@lhai.com
www.lhai.com

Posted: March 2008


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