HAYWARD, Calif.--(BUSINESS WIRE)--April 7, 2006--IMPAX Laboratories, Inc. (OTC: IPXL - News) today announced that Wyeth (NYSE: WYE - News), has filed a lawsuit against the Company in the United States District Court for the District of Delaware alleging patent infringement related to IMPAX’s filing of an Abbreviated New Drug Application (ANDA) for generic versions of Effexor XR® 37.5mg, 75mg and 150mg capsules. IMPAX’s submission includes a Paragraph IV certification stating the Company believes its product does not infringe upon Wyeth’s listed patents.
