I take Prozac for anxiety and OCD. The only side effect I noticed was being tired. It seemed to last a long time for me, but everyone is different. It also could have just been me, as I have always needed a lot of sleep to function. The meds really did help with anxiety and panic. I have anxiety over a phobia of vomiting which caused me to completely avoid eating. I would eat very little at a time and even go days without food. I developed an aversion to eating and I would get so anxious that I wouldn't be able to swallow. This caused me to drop 20 lbs in a short period of time. I'm 5'1", female, and had weighed about 115lbs prior to this disorder, but ended up dropping down to 91lbs. Once I began Prozac, the anxiety over eating greatly reduced and I was able to eat again more normally. I still struggle at times but I would say my situation improved tremendously.