Topiramate
"I have been on Topamax for a little over a year now to treat severe migraines.  I started from 25 mg and slowly went up to 150mg.  I used to get 3-4 migraines a week and now they are down to maybe once a month, if that.  For that it has been a life saver, but there are a few side effects. The tingling in the hands and feet went away completely after a few weeks on the final dose. but the mental fog is a side effect that stayed.  I still have trouble concentrating and remembering things, especially details & sometimes have trouble finishing a sentence. I am a student and I use to get A's all the time and now I can study for hours and will not get anything higher then B.  To me this is a price to pay for being migraine free."