I reported a bad experience here a few years back. I have always suffered from mild orthostatic hypo-tension (I get dizzy when standing up at times). Flomax can exacerbate that. In my case, I would get dizzy and pass out when I got off the bike after riding 20-30 miles. I wasn't exhausted - I would just suddenly get dizzy with no forewarning. I switched to Avodart and have not had the same problems. Flomax worked a bit better so I would go for that if not for the hypotension.