I took Prozac in late highschool for about 1.5 years. It kicked ass. Meaning: it worked, big time. I still look back on that time as genuinely happy. 2 side effects for me were:
1. nausea/weight loss - it made me feel like puking, I didn't eat, I lost 15 lbs. and made the guidance counsellor dramatically accuse me of being anorexic
2. it made me unlikely to have an orgasm - I liked being happy better, so I didn't care very much about this
To this day I recommend Prozac, with the caveat that my experience won't necessarily be everyones. It worked fast and well, and it never made me feel like I was not 'myself' - if anything I felt more like myself on it.