Prozac (fluoxetine) was the first antidepressant I ever tried. It didn't really help me much, personally. But at the time I wasn't really helping myself much either, so any antidepressant hardly had a good chance of working for me. I was using a lot of recreational drugs and drinking A LOT of alcohol, so my brain was pretty fucked from that. I suffered with some pretty lengthy side effects even after coming off it as well.
BUT everyone responds to different medications differently, so in some ways even asking this question is kinda moot. For example the antidepressant that I'm on now, duloxetine, literally saved my life and is the perfect antidepressant medication for me, however I have heard some real horror stories of people trying duloxetine and it making them MUCH much worse. Everyone is different.
Has your doctor prescribed it to you? If so, you should take it as prescribed, take good care of yourself, and see how it goes. If after a couple of weeks it's not helping at all, or if you're getting worse, go back to your doctor and try something else.