Viagra, drug

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. See also PDE-5

Viagra (Sildenafil) Tablet: Treatment for Erectile Dysfunction, Sexual Impotence and Prevention of Phosphodiesterase Enzyme.: McCray, Dr Minh A: 9781387574001: : Books

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