- Men with partners of childbearing potential must be willing to use 2 medically acceptable methods of contraception during the trial and for 1 month after the last dose of study drug. Effective birth control includes (a) intrauterine device (IUD) plus 1 barrier method; (b) stable doses of hormonal contraception for at least 3 months (eg, oral, injectable, implant, transdermal) plus 1 barrier method; (c) 2 barrier methods. Effective barrier methods are male or female condoms, diaphragms, and spermicides (creams or gels that contain a chemical to kill sperm); or (d) vasectomy.