Overview

Viagra was developed in the United Kingdom. In 1998, the American pharmaceutical company, Pfizer Inc., put the drug on the market. The generic name for Viagra is sildenafil, and Viagra is a brand name.Viagra is used to treat erectile dysfunction (impotence) in men. Another brand of sildenafil is Revatio, which is used to treat pulmonary arterial hypertension and improve exercise capacity in men and women. This page contains specific information for Viagra, not Revatio. The drug also goes by the name of Revatio. Viagra works by slowing down the action of PDE5, an enzyme that works in the penis tissues. The PDE5 enzyme breaks down a substance that is responsible for blood flow in the penis. Inhibiting PDE5 increases blood flow to the penis. This helps men to achieve and maintain an erection. Viagra is one of the most controversial and widely discussed pharmaceutical drugs to have hit the market in the last 30 years. People most commonly use Viagra to treat erectile dysfunction.It works by relaxing the muscles in the walls of blood vessels in certain areas of the body. In most cases, Viagra works well and has changed people's lives for the better.

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