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Information about erectile dysfunction drug Viagra, from Pfizer. Find out about how Viagra works, its common side effects, and if it's right for you. From Pfizer.

Provides information about Viagra including its side effects and drug interactions.

Offers a clinical overview of how prescription drug Viagra affects nitric oxide levels in the blood as well as sections on recommended dosages and warnings.

User-edited article about sildenafil, the drug sold under the name of Viagra, used to treat male erectile dysfunction and pulmonary arterial hypertension.

Offers information on the oral medications of Viagra, Levitra, and Cialis, the drugs used to treat erectile dysfunction.

Taking Viagra relaxes the blood vessels in the penis. This allows blood to flow into the penis causing an erection. However, it will only help you get an ...

Basic facts on the erectile dysfunction medicine Sildenafil (brand name Viagra), including its potential side effects and interactions with other medications.

Don't take VIAGRA if you take nitrates, often prescribed for chest pain, as this may cause a sudden, ...The most common side effects of VIAGRA are headache, facial flushing, and upset stomach....

An interactive resource for 14 to 16 year old biology students about developing of Viagra and how it targets enzyme action to treat ED.

VIAGRA actúa aumentando el torrente sanguíneo donde y cuando usted lo necesita....VIAGRA es un medicamento utilizado para tratar la disfunción eréctil (DE)....