- Female subjects of childbearing potential must be practicing abstinence or are using, and willing to continue using, a medically acceptable form of birth control for at least 1 month prior to Screening (at least 3 months for hormonal contraceptives) and for at least 2 months after the last study drug administration. Medically acceptable forms of contraception include abstinence, hormonal contraceptives (oral, patch or vaginal ring), intrauterine device, progestin implant or injection, bilateral tubal ligation, or double-barrier methods (i.e., male condom in addition to a diaphragm or a contraceptive sponge).