I was on Prozac for a few months and while it did reduce anxiety, the effect was fairly mild. The problem was that it destroyed my sex drive. Even worse because of the way it hammers down on emotional extremes, I even started questioning my relationship with my girlfriend like I didn't care one way or the other about her. I stopped using it and went back to depressed normalcy within 3 weeks. That was when I decided to try cardio and dietary improvements. After a month of that, I felt less depressed than ever and haven't looked back.