I was prescribed this by a urologist at Bangkok hospital. After two months there was better flow, but I had side effects of a horrible cold, or sinusitis, severe back pain and was heading towards impotence, I stopped then. Started on Saw Palmetto. It has done the trick, Back pain almost gone, cold symptoms much better as well and impotence is gone. The "famed' Urologist never even informed me of any possible side effects.