2. Eligible female subjects of childbearing potential with a non-sterilized male sexual partner must agree to use 2 medically accepted, effective methods of birth control (eg, hormonal contraceptive, barrier contraceptive with additional spermicide, or an intrauterine device) beginning >30 days prior to study drug administration and continuing until 7 days after the end of the study. Female subjects who are postmenopausal must have been postmenopausal for >1 year if they wish not to use contraceptives. If postmenopausal status is questionable, the subject's follicle-stimulating hormone level must be checked and must be elevated and consistent with postmenopausal levels (ie, >40 IU/L); otherwise these subjects must agree to use contraceptives listed above;