- Women of childbearing potential (WCBP ) must have a negative serum or urine pregnancy test within 7 days of baseline. In addition, sexually active WCBP must agree to use adequate contraceptive methods (oral, injectable, or implantable hormonal contraceptive; tubal ligation; intra-uterine device; barrier contraceptive with spermicide; or vasectomized partner) while on study drug.