Bloomberg -- Pfizer Inc., the world’s biggest drugmaker, filed a patent-infringement lawsuit against four companies including Apotex Inc. and Mylan Inc. to block sales of generic versions of the erectile-dysfunction drug Viagra.
Bloomberg -- Pfizer Inc., the world’s biggest drugmaker, filed a patent-infringement lawsuit against four companies including Apotex Inc. and Mylan Inc. to block sales of generic versions of the erectile-dysfunction drug Viagra.
