Viagra

Viagra is a prescription medication licensed for the treatment of erectile dysfunction. The drug works by blocking a chemical that causes blood to flow out of the penis. In previous clinical studies, up to 88 percent of men reported improved erections after taking this drug. For most men, the medication starts working within 30 minutes. The most common side effects of Viagra include headache, facial flushing, and indigestion.

What Is Viagra?

Viagra® (sildenafil citrate) is a prescription medication used for treating problems with obtaining or maintaining an erection. Erectile dysfunction (ED), also known as impotence, can be a total inability to achieve an erection, an inconsistent ability to do so, or a tendency to sustain only brief erections. Essentially, erectile dysfunction is the repeated inability to get or keep an erection that is firm enough for sexual intercourse.
 
(Click Viagra Uses for more information, including possible off-label uses.)
 

Who Makes Viagra?

Viagra is manufactured by Pfizer, Inc.
 

How Viagra Works

The medication works by blocking a chemical that causes blood to flow out of the penis. More blood in the penis means an improved erection.
 
(Click How Does Viagra Work? for more information.)
 

Effects of Viagra

In previous clinical studies, up to 88 percent of men reported an improvement in their erections when taking Viagra. It was also shown to be effective in men with certain medical conditions and after various types of surgeries (see Effects of Viagra for more information).
 
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Viagra (Sildenafil) Medication Information

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