- Female subjects who are pregnant, breast feeding, or if of childbearing potential, is not using or is unwilling to use an effective form of contraception during the study and for a period of 30 days following final dosing. Acceptable methods of contraception include barrier method with spermicide, intrauterine device (IUD), steroidal contraceptive (oral, transdermal, implanted or injected) or abstinence. If the exclusive male partner is surgically sterile, this will be acceptable.