- Women of childbearing potential (includes women who are less than 1 year postmenopausal and women who become sexually active) must be using or agree to use an acceptable method of birth control (e.g. hormonal contraceptive, medically prescribed intrauterine device, condom in combination with spermicide) or be surgically sterilized (e.g. hysterectomy or tubal ligation). Women of childbearing potential who are not currently sexually active must agree and consent to use one of the above-mentioned methods, should they become sexually active while participating in the study.