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Viagra: the facts behind the hysteria | #viagra #sildenafil #cialis #levitra #kamagra #nizagara #sildenafil citrate #Generic Viagra #Pfizer

Viagra: the facts behind the hysteria

Sildenafil citrate as a newly discovered substance was patented by Pfizer in the beginning of 90s and approved by FDA in 1998. During the following decade and a half Viagra was available only in form of drug produced by the original manufacturer, due to the validity of patent. As of recent

Viagra: the facts behind the hysteria

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02/18/94
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