benign prostatic hyperplasia
"My doctor started me on Tamsulosin one week ago.  Some improvement after 2 or 3 days, but I am experiencing side effects.  The first is about sex life as I have no ejaculation (later I found that it is actually a "retrograde ejaculation").  This is a very unconfortable feeling, as you feel that sperm remains somewhere inside you (later I found by reading that it goes in the bladder).  The second side effect is feeling a bit weak and tired all day long.  I do not think I can endure this drug for the rest of my life, therefore I will soon see my doctor for other alternatives, hoping they exist."