We sell probably 60-70 prozac prescriptions a week! A very popular and effective antidepressant. I am taking Lexapro, different SSRI because it has more anticholinergic effects, which also helps with my GAD or generalized anxiety disorder.
Fluoxetine (prozac) is a great antidepressant for people that get "typical" depression symptoms. Depression can either manifest as overeating and oversleeping or insomnia and not eating. Those two categories summarize the most basic reactions people have to depression. If you feel "down" all the time, then fluoxetine is the first antidepressant I would recommend.
It can take up to 6 weeks to obtain the maximum effect, most people will see results within 2 to 3 weeks. My only advice would be to take it every day, not only on the days taht you feel depressed.