Of course everyone is different, but for me, some of the side effects took some getting used to. Loss of apetite isn't so bad-unless you don't need to lose weight. I lost 12 pounds in 6 weeks before my husband finally got where he was making me eat some protein bars and the like. I have some numbness and tingling in the hands and feet and at first there was some confusion. Just little things like forgetting where I put things and losing count when I was exercising-but that passed. I've heard that some people also have bowel problems as well, luckily, I've not had that. But on the plus side, my head aches are not as frequent or as severe since being on the topamax. Good luck to your 17 year old on the medication.