Using Flomax for about 9 months now, the first 2 months it seemed to make be urinate more often and I did get dizzy going from seated to standing positions, but those side effects gradually disappeared over time. However, if I take it in the evenings it causes me to wake up multiple times during the night, to urinate. So I take it in the mornings now, with few side effects. Really the only side effect I have now is the inside of my nose is dry, just use saline spray to help this. Anyway, this is my experience so far.