Is it safe to assume that if you took a med for a number of years and got side effects: A, B, C that if you took that med again years later you would ge the same side effects or different ones or continue NOT to get a particular side effect? For ex. I was on Dilantin for years and never had one problem with my teeth and if I were to take Dilantin again would the chances of my teeth remaining in tact be higher considering I never had the problem before while taking that med? Just asking because I may go on Tegretol and the only side effect I recall was being slow, which I had with Dilantin anyway, but now since being on Keppra and Lamicatal and losing my hair I'm afraid to take anything. Dilantin and Tegretol I never lost hair and my neuro wants to put me on Tegretol but I'm afraid of losing my hair and he says, "You were on this before and never lost hair, so no worries." O.K. so I trust those who take the drugs more than the neuros : ) Thanks.