Pfizer Inc. Wins RAPAMUNE® Patent Case in Delaware District Court

Published: Jan 31, 2013

NEW YORK--(BUSINESS WIRE)--Pfizer Inc. said today that the United States District Court for the District of Delaware ruled that Pfizer’s patent covering a method for using sirolimus, the active ingredient in RAPAMUNE®, for the inhibition of organ transplant rejection is valid and infringed. The company brought a patent infringement action in April 2010 against the generic company Watson Laboratories, Inc—Florida (now known as Actavis) and three other Watson entities after Watson applied to the FDA to market a generic version of RAPAMUNE®. The Court’s decision prevents Watson from marketing its generic version of RAPAMUNE® in the U.S. before Pfizer’s patent expires, pending a possible appeal by Watson.

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