- For men with female partners of childbearing potential, agreement not to donate sperm and to inform their female partner of their participation in this clinical study and use highly effective methods of birth control for five months after last dose of study medication. Highly effective methods of birth control include abstinence, vasectomy, or a condom with spermicide in combination with either hormonal birth control, Intrauterine device (IUD) or barrier methods used by the woman.