seizure prevention
"I took Topamax for approximately 5 years with little trouble. I did have the metallic taste, and could not drink carbonated beverages. In July 2009, I had to quit Topamax due to a little published side effect, kidney stones. I was on a pretty large dose (600 mg).

I had a 9mm Kidney stone and many many small stones. I take Keppra XR now. It prevents the seizures, but I have gained all the weight plus some that I had lost on Topamax, but no seizures or kidney stones."