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What are the side effects of Viagra?

Viagra (generic name sildenafil) is a medication used to treat men who have trouble getting an erection. The most commonly reported side effects of Viagra include headache, nasal congestion and redness in the face or chest. These tend to be mild and go away within a few hours. Less common side effects include temporary changes in vision, such as trouble telling the difference between blue and green, seeing a bluish tint to objects, being more sensitive to bright light, and blurred vision.

Make sure you call your doctor if you experience an erection that lasts longer than four hours.

Sources:
Micromedex Healthcare Series. Micromedex Inc., 2001.
Viagra product information, Pfizer Labs, 2000.
Moreira SG. “Side-effect profile of sildenafil citrate (Viagra) in clinical practice.” Urology 56 (2000).

This answer prepared 02/20/01.

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