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- Sildenafil - Wikipedia
"Pfizer to lose patent of drug Viagra, Indian companies gear up with copycat versions: Pfizer's patent for the formulation of Viagra, used to treat impotence in men, ends in the US in 2020"
- Sildenafil (Viagra, Revatio) - Uses, Side Effects, and More
Find patient medical information for Sildenafil (Viagra, Revatio) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings
- Viagra | drug | Britannica
Viagra, trade name of the first oral drug for male impotence, introduced by the pharmaceutical company Pfizer, Inc , in 1998 Also known by the chemical name sildenafil citrate, it is one of a category of drugs known as phosphodiesterase-5 inhibitors
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