- Male subjects (unless surgically sterile) with female spouses/partners who are of childbearing potential, and not using a barrier method of contraception during the study and for 30 days after final study drug administration. In addition, female spouses/partners of male subjects and who are of childbearing potential should also use a highly effective method of birth control during the study and for 30 days after final study drug administration. Highly effective methods of birth control are defined as those, alone or in combination, that result in a low failure rate (i.e. less than 1% per year) when used consistently and correctly.