benign prostatic hyperplasia
"I'm 65 and have had weak flow for years.  It seems I've tried every drug available, but not much relief.  First dose of Rapaflo gave noticeable improvement within hours.  I thought I had found the solution until the diarrhea started.  Cut the dose to the 4mg capsule once per day and diarrhea solved, but sexual problems set in.  No ejaculation.  Judging from this site this is not a minor side effect, but almost a guarantee.  After a few weeks I began to have increasing difficulty reaching orgasm at all.  My sex life is fading fast.  Rated +10 for effectiveness and 0 for side effects."