Hannah, I am surprised topamax does anything for you at only 25 mg., and that you could tell a difference between generic and brand name at so small a dose.

Sonny, I have never seen itching noted on this board as a side effect of topamax. I have had the tingly itchy won't stop places when on topamax or not on it. I think it is the nerves acting up. About all you could do is ask the doc to taper off of it, see what happens.

If you actually have what looks like a rash, try soaking in a tepid bath with Aveno powder. Buy the generic, it is less expensive. It is finely ground oatmeal.

My other thought is, have you been on any antibiotics lately? If so, you could have a yeast growth on your skin surface. That itches like crazy.

Edited to say after posting I did a google search for topamax and itch and did come up with a lot of hits! Huh! I have been on and off this med for years and did not know of this side effect. I know it makes me have tingling, but did not know of itching.