Topamax
"I seemed to catch everything while I was on this rx. First it was a really bad cold, next I could not seem to heal from surgery for deviated septum - my ENT was stumped, then later I caught the flu while the rest of my family seemed fine. Also during this 6 month period I had a couple of sinus infections. Eventually, I knew something was very wrong. I started searching the Internet for immunity issues and topiramate, and I got a couple of hits from blogs where women about my age (40s) claimed that topiramate had wrecked their immunity. Alas, my search (and problem) was over because I knew exactly what they meant by "wrecked my immunity". Within a few short weeks of ceasing the use of topiramate, my health returned.  Please beware!"