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Erectile dysfunction (ED) is the inability to get or keep an erection firm enough for sexual intercourse. ED can be a total inability to achieve an erection, an inconsistent ability to do so, or a tendency to sustain only brief erections.
ED is sometimes called impotence, but that word is being used less often so that it will not be confused with other, nonmedical meanings of the term.
The National Institutes of Health estimates that ED affects as many as 30 million men in the United States. Incidence increases with age: About 4...