1. Pregnant women or women of child bearing potential who are not using a medically accepted means of contraception (condom, diaphragm, spermicide, intrauterine device, tubal ligation, or partner with vasectomy). Because of the risk of the lowering of oral contraceptive blood levels with topiramate, women whose sole means of contraception is oral contraceptives or hormonal implants will be asked to use an additional barrier method of birth control during treatment with the study drug.