Doxazosin
"I started on 1 mg for a couple of days, then 2 mg for a couple of days. I was on 4 meg only 4 days and 8 meg for just two. At that point, I was so dizzy I could barely drive. I was actually getting motion sickness as a driver, and I drive probably 25,000 miles a year. I could actually feel my prostate shrink, but had some horrible side-effects. My semen dried up to nothing, and as far as ejaculating during sex--forget it. I took the drug only a total of two weeks, and I've been off it for 10 days, and still can't get an erection. Fortunately, the dizziness cleared up after about 3-4 days after stopping. I can't find any documentation at all to show how long the drug persists in the average person."