Is it okay to just stop taking Prozac?

No. Quote from the Related Link: "Do not suddenly stop taking Prozac without checking with your doctor. Side effects may occur. They may include mental or mood changes, numbness or tingling of the skin, dizziness, confusion, headache, trouble sleeping, or unusual tiredness. You will be closely monitored when you start Prozac and whenever a change in dose is made." If you want to stop taking it, you need to TAPER the dosage down, in other words, take a bit less at a time, with a doctor's help.