Prozac/Fluoxetene DOES NOT CAUSE WEIGHT GAIN, ACTUALLY IT CAUSES LOSS OF WEIGHT.
If you want to see it other side effects, http://www.healthcaremagic.com/drugs/Fluoxetine/193165566613
The one thing to remember is you will not get all the side effects listed and you may not get any at all. It is unpredictable. For legal reasons, all the side effects have to be listed.
Please have a discussion with a psychiatrist
if you have any further queries.