Viagra is specifically designed to block a chemical that causes blood to flow out of the penis. Because of this effect, the medication causes more blood to remain in the penis, which means an improved erection.
Erectile dysfunction (
ED), also known as
impotence, is defined as 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 firm enough for sexual intercourse.
(Click Viagra Uses to learn more about this medication, including who can use it and possible off-label indications. This article also describes how Viagra works.)
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