i just started taking it and my doctor said that it amplifies the effects of alcohol and if you drink a lot on it it can make you really sick. He said it makes one drink feel like two, so my guess is that a couple drinks would be fine. He advised me not to drink at all on it but i was a very heavy drinker so i think this was advice to me personally.
I think most anti-depressants have similar interactions with alcohol, not just
prozac, so you may have difficulty finding one that has no effect on drinking.