- Women of child-bearing potential must either commit to continued abstinence from heterosexual intercourse or begin one acceptable method of birth control (intrauterine device, tubal ligation, or partner's vasectomy) while on therapy and for three months after the last dose of therapy. Hormonal contraception alone is an inadequate method of birth control. Female patients must agree not to donate lactation during treatment and until 3 months after end of treatment.