I took 100 Mg of Topamax for 2 weeks. I took it for extreme headaches (everyday all day) and seizures. Although it stopped both, the worst side effect i suffered was hallucinations. I was in tears most of the time after I would hallucinate. Other side effects were weight loss (about 8 pounds for the little time i was on the drug), couldnt concentrate, and tingling of the hands, feet, and face.