- (For females of childbearing potential) agree to have urine pregnancy testing performed at Visit 1 (must be negative) and at exit visit; must not be lactating; and must agree to use a medically acceptable form of birth control1 throughout the study duration. Women of childbearing potential include all females who have experienced menarche and have not experienced menopause (as defined by amenorrhea for greater than 12 consecutive months) or have not undergone successful surgical sterilization (hysterectomy, bilateral tubal ligation, or bilateral oophorectomy).