Ferring B.V. v. Watson Labs, Inc., FL, No. 14-1377 (Fed. Cir. 2014)
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Tranexamic acid, the active ingredient in Ferring’s patented product, is used to treat heavy menstrual bleeding (menorrhagia) in women. Tranexamic acid has been widely used in an immediate release formulation for more than 30 years to treat menorrhagia in other countries. Ferring developed a tranexamic acid formulation with fewer gastrointestinal side effects than the immediate release version used abroad, but with the same benefits, by creating a formulation with a tranexamic acid release rate that matched the rate of absorption in the gastrointestinal tract. Ferring’s commercial product is known as Lysteda. In 2004, the FDA approved a fast-track designation for approval of Lysteda, and the Lysteda New Drug Application was approved in 2009 as the first tranexamic acid drug approved for use in the U.S. Apotex sought to market a generic version of Lysted that would avoid infringement of Ferring’s patent applications, but that would be bioequivalent to Lysteda, by altering the rate of absorption. Ferring then sued Apotex for infringement. The district court dismissed after Apotex amended its Abbreviated new Drug Application
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