Ive taken this for about a year now and its been SUCH a lifesaver. It prevents migraines. It can have some side effects like loss of appetite and a bit of foggy headedness especially in the beginning but I used to get up to 4 migraines a week and now I might get one every 6 months
Topamax is used to prevent migraine. It will not stop a migraine that's already occurring. It is not a pain medication.
You can read about it at Topamax.com.