Outcome Parameters. The goal of this preliminary study is to obtain data regarding the fluctuation, during one menstrual cycle, of several hormones in epileptic and non-epileptic women of reproductive age. If the data show a relationship between (i) falling levels of plasma progesterone and allopregnanolone, (ii) increased levels of DHEA or pregnenolone or (iii) increased ratios of estrogen/progesterone, DHEA/progesterone, DHEA/allopregnanolone, pregnenolone/allopregnanolone and seizure manifestations and EEG documented interictal spike and seizure activity it would support the hypothesis that alterations in the levels of these steroid hormones are related to seizure exacerbations in women with catamenial epilepsy.