Here are some ...: After Viagra (sildenafil, a PDE-5 inhibitor) from Pfizer ran out its patent in 2012, some generic drug companies have taken free ride to sell sildenafil by improvising Brand name similar to Viagra; Vigora is one of them. However, somehow, Pfizer was legally granted its full rights of marketing extension up to 2019 so the price of all PDE-5I remains steep in favor of drug companies. That is Vigora
Answered 9/14/2014
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