What is sildenafil?

* Sildenafil relaxes muscles within the penis. This allows increased blood flow into the penis, necessary to achieve and maintain an erection.

* Sildenafil is used to treat erectile dysfunction (impotence).

* Sildenafil may also be used for purposes other than those listed in this medication guide.

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How should I take this medicine?

Take sildenafil tablets by mouth. Follow the directions on the prescription label. The dose is usually taken 1 hour before sexual activity. You should not take this dose more than once per day. Swallow the tablets with a drink of water. Do not take double or extra doses.

What happens if I overdose?

* Seek emergency medical attention.

* Symptoms of a sildenafil overdose are not known, but are likely to include chest pain, dizziness, an irregular heartbeat, and swelling of the ankles or legs.