- Women must be postmenopausal for at least 2 years, OR be surgically sterile (have had a total hysterectomy or bilateral oophorectomy, tubal ligation/bilateral tubal clips without reversal operation, or otherwise be incapable of becoming pregnant), OR be not heterosexually active for the duration of the study or have a vasectomized partner (confirmed sterile) OR if of childbearing potential and heterosexually active, be practicing a highly effective method of birth control (as specified below) before entry, and agree to continue to use a highly effective method of contraception throughout the study. Women with tubal ligation are required to use one contraceptive method (Note: A male and female condom should not be used together due to risk of breakage or damage caused by latex friction)