I have BPH. After drinking a cup or so of liquids, I must take a pee after
one hour and a half, sometimes 2 hours. I must drive a car for several hours
in the highway, sometimes with passengers. Also, even in the cinema, it is
very embarrassing to get up in the middle, disturbing ...

So, I've started taking Flomax about two weeks ago and it works for
me, gets me through a night without the need to pee.
Been taking it half hour after a  light breakfast.
The only side effect that I have experienced is constipation.