Viagra is the brand name of the drug sildenafil citrate, which is used to treat male erectile dysfunction (ED), also referred to as impotence. In 1998, Viagra became the first drug officially approved for treatment of erectile dysfunction in the United States. It was shown to be successful in 4 out of 5 men. Viagra comes in pills of 50mg or 100mg each with 50mg being the recommended dose for most men. The patient should take the pill at least 30-60 minutes before sexual intercourse. It lasts 4 hours and can be taken up to three times a day. The success rate of oral ED drugs is very high, above 90%; however different people require different dosages to attain optimum results.
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