I have been on Topamax for a year. I am on a low dose of 25mgs morning and night for Migraine prevention (instead of the Verapamil I had been taking for years). I am pleased with the results. No migraines. I do not drink soda any more due to the after taste but thats fine. I think I am a little more "hazy" in my thought process but not to an extent of it interfering with my life. I will see how I continue.