 - Female subjects of childbearing potential practiced abstinence or used and were willing to continue to use a medically acceptable form of birth control for at least 1 month prior to Screening and for at least 1 month after the last study drug administration. Medically acceptable forms of contraception included intrauterine device or double-barrier. Hormone-based contraceptives methods were not acceptable, because ESL may have decreased their effectiveness. Female subjects of non-childbearing potential were amenorrheic for at least 2 years or had a hysterectomy andor bilateral oophorectomy. 