- Female of childbearing potential (FCBP*) must agree to use a reliable form of contraception or to practice complete abstinence from heterosexual intercourse for at least 28 days before starting study drug, while participating in the study, and for at least 28 days after discontinuation from the study. The methods of reliable contraception include intrauterine device (IUD), hormonal (birth control pills, injections, or implants), tubal ligation, partner's vasectomy, latex condom, diaphragm and cervical cap.