- Female subjects must be post-menopausal (i.e. >6 months without menstrual period), surgically sterile, or if of child-bearing potential, using effective contraceptive measures (oral contraceptives, Norplant, Depo-Provera, an intra-uterine device (IUD) a diaphragm with spermicide or a condom with spermicide). Women of childbearing potential must use effective contraceptive measures throughout the study and for 30 days after discontinuing study medication. The subject and their caregiver must ensure that the subject will continuously use contraceptive measures throughout the duration of the study.