 7. Females of childbearing potential FCBP must have a negative urine pregnancy test at screeningbaseline Visit 1. In addition, sexually active FCBP must agree to use TWO of the following adequate forms of contraception while on study medication: oral, injectable, or implantable hormonal contraceptives; tubal ligation; intrauterine device; barrier contraceptive with spermicide; or vasectomized partner. A FCBP must agree to have pregnancy tests every 28 days while on study medication. 