Endo Hits Impax With 3rd Suit Over Painkiller

Law360 (July 29, 2008, 12:00 AM EDT) -- Endo Pharmaceuticals Holdings Inc. and Penwest Pharmaceuticals Co. have slapped Impax Laboratories Inc. with a third patent infringement suit over the company's attempts to manufacture its generic version of pain treatment Opana ER.

The latest suit, filed Friday in the U.S. District Court for the District of Delaware, responds to a notice Impax sent the other two companies on June 13, informing them that it had amended its abbreviated new drug application to include three new dosage sizes of the generic painkiller.

On March 3, Endo...
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