- Men (including those who have had vasectomies) must agree to use condoms even if their partner is pregnant (this is to ensure that the fetus is not exposed to the study drug through vaginal absorption) and to not donate sperm during the study and for 3 months after receiving the last dose of study drug. Male participants should encourage their female partner to use an effective method (for example (eg), prescription oral contraceptives, contraceptive injections, intrauterine device, and contraceptive patch) of contraception in addition to the condom used by the male study participant