- Women of child-bearing potential must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry and for the duration of study participation. A negative serum pregnancy test must be obtained within 72 hours of receiving the first dose of the hormonal therapy as well as within 72 hours of the first dose of the MK-0752 GSI medication for women of child-bearing potential. Should a woman become pregnant or suspect she is pregnant while participating in this study, she should inform her treating physician immediately.