- Females not of childbearing potential or has documentation of a negative pregnancy test prior to the start of the study treatment are eligible. Sexually active pre-menopausal female subjects must agree to use adequate, highly effective contraceptive measures, while on study and for 45 days after the last dose of last study drug. Effective birth control includes (a) intrauterine device (IUD) plus one barrier method; (b) oral, implantable or injectable contraceptives plus one barrier method; or (c) 2 barrier methods. Effective barrier methods are male or female condoms, diaphragms, and spermicides (creams or gels that contain a chemical to kill sperm).