Pfizer's billion-dollar Celebrex patent loss has Mylan, Actavis revving up generics

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One of Pfizer's top-selling products is suddenly vulnerable to generic competition 18 months earlier than expected. A U.S. court nixed a key Celebrex patent, putting the pain drug up for a sales fight in May. And generics makers Mylan and Actavis are promising to launch their versions as soon as Pfizer's monopoly expires.