- Females must be surgically or biologically sterile or postmenopausal or if of childbearing potential, must agree to use an adequate method of contraception during the study until 30 days after the last treatment. Males must be surgically or biologically sterile or agree to use an adequate method of contraception during the study until 30 days after the last treatment. Should a woman become pregnant or suspect she is pregnant while participating in this study, she must inform her treating physician immediately.