- Female subject must use a double contraception method including a highly effective method of birth control except if she has undergone sterilization at least 3 months earlier or is postmenopausal. The accepted double contraception methods include the use of 1 of the following contraceptive options: (1) intrauterine device; (2) condom or diaphragm or cervical/vault cap, in addition to spermicide. Menopause is defined as being amenorrheic for at least 2 years with plasma follicle-stimulating hormone (FSH) level >30 IU/L. Hormonal contraception is NOT acceptable in this study due to drug interaction.