My urologist put me on Flomax to help reduce my PSA level and help me urinate better. I took it for 5 weeks and was able to urinate normally. At the same time I developed terrible congestion which appears to have caused a sinus infection. I did some research on the Internet and found out that one of the side effects of Flomax was the congestion. I told my doctor and he said that I should stop taking the Flomax. I've been off it 3 days now I am on antibiotics to help my sinus infection. Has anyone else experienced this and how long after stopping Flomax did the congestion clear up?