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.
Viagra is manufactured by Pfizer, Inc.
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.
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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