- Pregnant or breast-feeding women will not be entered on this study; pregnancy tests must be obtained in girls who are post-menarchal; females of reproductive potential may not participate unless they have agreed to use an effective contraceptive method for the duration of study treatment; males with sexual partners who are pregnant or who could become pregnant (ie, women of child-bearing potential) should use effective methods of contraception for 12 weeks after completing the study to avoid pregnancy and/or potential adverse effects on the developing embryo