We investigated the actions of the neuroactive steroid, pregnanolone, and the ovarian steroid, 17-estradiol, on seizure expression during two time points of ethanol withdrawal (EW). Both steroids can exert rapid, nongenomic actions on the brain that include modulation of seizure activity. Because their basal levels differ in adult males and females and a major symptom of EW is increased seizure risk, we wanted to determine whether these steroids were anticonvulsant during EW. Rats were made ethanol-dependent by administration of 6% ethanol in a nutritionally complete liquid diet for 14 days. After removal of the ethanol-containing diet, EW and paired control rats were tested at 1 or 3 days for seizure responses to pentylenetetrazol. Consistent with previous reports, females seemed to have recovered from EW more quickly than males. We observed significant sex differences in responses to the steroids, primarily at 3 days EW. Pregnanolone afforded protection against seizures with larger effects during EW than in control conditions and greater effects in female than male rats. In contrast, effects of estradiol were mixed. Some responses of ovariectomized female rats were similar to intact females, whereas other responses were more similar to males. Our behavioral findings are consistent with observed EW-induced changes in plasma corticosterone levels, showing persistent elevations in male but not female rats. These results support and extend earlier findings suggesting that although the hormonal milieu influences EW, innate differences in brain structure between the sexes also contribute to sex differences in EW.Ethanol dependence develops from prolonged intake, is often disruptive to the social, occupational, and physical well being of the individual, and poses significant health and economic burdens. Withdrawal-induced seizures are a significant consequence of ethanol dependence and include risk of injury, even death. Treatment of ethanol withdrawal (EW) remains problematic because of the reduced effectiveness of anticonvulsant drugs due to cross-tolerance with ethanol. The distress and dysphoria of ethanol EW, including enhanced seizure risk, probably contribute to the high risk for relapse.Several clinical studies have found sex differences in the expression of EW behaviors and ethanol-induced diseases that have important ramifications for treatment (Ashley et al., 1977;Brown et al., 1988;Schenker, 1997;Deshmukh et al., 2003). These differences support a growing body of evidence showing that males and females have significant differences in inherent neurobiology expressed as varying risks for a number of neuronal-based diseases and responses to stressors, including alcohol (Brathen et al