- Non-pregnant (if female). Women of childbearing potential (fertile females) must have a negative serum or urine pregnancy test within one day of starting study drug. In addition, sexually active fertile female subjects must agree to adequate contraceptive methods (oral, injectable, or implantable hormonal contraceptive; tubal ligation, intrauterine device, barrier contraceptive with spermicide; or vasectomized partner) while on study drug. Men must agree to use latex condoms when having sex with fertile women.