I have just started using Flomax. My first experiences of side effects seem to include insomnia, negative dreams which are exceedingly rare for me otherwise, dizziness when standing up to urinate at night, and pressure in my ears so that I can even hear my heart beat at night, or the sign of heart beat in my ears from effects on blood vessels in the ears. I have not given it sufficient "trial" but these are noticable side effects, so far.