I started topamax 2 years ago for severe migraines. Last July (2005) I started to notice my hair falling out, on my clothes, my chair at work, in the tub, my combs, etc. In October, it became so thin I decided to cut 7" off my hair. I would say I had lost 50% volume. My doctors all said don't know what the problem is, everything is normal, all tests are ok, including dermatologist. He mentioned Telogen Effluvium and that I wouldn't go bald. Well, that was reassuring.