- Females of childbearing potential must: Agree to use using a reliable form of contraception (eg, oral contraceptives, intrauterine device, double barrier method of condom and spermicidal) for at least 28 days prior to the first dose of any study drug, during the Treatment Period (and Treatment/Follow-up if receiving study drug), and for at least 70 days after the last dose of any study drug; have a negative serum β-human chorionic gonadotropin (β-HCG) at Screening.