Sertraline
"I started 25mg of Zoloft two weeks ago. My experience is different because I started taking it after 6 months on Prozac. On Prozac  I ended up with paranoia, obsessive thoughts and certainty that I was going crazy, but didn't recognize it as a side effect of medicine. Finally, my therapist told me that Prozac must be making me crazy. As soon as I stopped Prozac and started Zoloft i felt better. I'm not yet sure if I feel better because I'm off Prozac or because Zoloft is working, but I'm calmer and feeling "normal". Still low and worried about everything."