I take antidepressants to get better energy during the day. When I'm off of them I'm like a zombie or on auto-pilot and constantly tired. I took Welbutrin, but they gave me stomach problems, but it worked. So my doctor switched me to Prozac. I have been on it for one week now. I don't feel any different. If you have taken it... How long did it take to feel the effects? Did you have any side effects?