There's no strong scientific evidence that BPH causes erectile dysfunction. But what makes this somewhat difficult for scientists to answer is that age is a risk factor both for BPH and for erectile dysfunction. Both occur at increasing frequency as men get older. So they frequently co-exist. But currently the feeling is that there's no strong evidence to suggest that one causes the other. More practically speaking, some medications used to treat BPH can cause erectile and sexual symptoms. For example, Proscar, a medication used to decrease the size of the prostate, may decrease libido and in a small percentage of patients cause erectile dysfunction. The separate class of agents called alpha blockers, which relaxes the prostate, can decrease the amount of the ejaculate. This is called retrograde.
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