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Sildenafil citrate is a prescription drug used to treat erectile dysfunction, also known as impotence. In clinical studies, up to 88 percent of men reported that the drug improved their erections. For most, the medicine begins working within 30 minutes and lasts up to four hours. Sildenafil citrate comes as a tablet that should be taken with a glass of water, and may be taken with or without food.

What Is Sildenafil Citrate?

Sildenafil citrate (Viagra®) 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 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 firm enough for sexual intercourse.
 
(Click What Is Sildenafil Citrate Used For? for more information. Please note that this article refers specifically to Viagra, the original sildenafil citrate product that is approved for treating erectile dysfunction. For information about the sildenafil citrate product used to treat pulmonary arterial hypertension, please see Revatio.)
 

Who Makes It?

Sildenafil citrate is manufactured by Pfizer, Inc.
 

How Does It Work?

Sildenafil citrate 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 Sildenafil Citrate

In previous clinical studies, up to 88 percent of men reported that the medication improved their erections. Sildenafil citrate was also shown to be effective in men with certain medical conditions and following various types of surgeries.
 
(Click Effects of Viagra for more information.)
 
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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