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The Evolution of Erectile Dysfunction Drugs since ViagraIntroduction Erectile dysfunction is the repeated condition where a male is not able to develop or maintain an erection firm enough for sexual intercourse. It is caused by both psychological and physiological factors. However, this condition is always treatable with drugs. ED as is commonly known varies in severity. For some men, it is a total inability to achieve an erection. Others have inconsistent ability to achieve one while others can only sustain brief erections.
