- Because of the risks of drug treatment to the developing fetus, women of child-bearing potential and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) for the duration of study participation, and for four months following completion of study therapy. Should a woman become pregnant or suspect she is pregnant while participating in this study or if she is the partner of a male participant in this study and becomes pregnant while he is participating in this study, she should inform her or her partner's treating physician immediately as well as her obstetrician. Female study patients who become pregnant must immediately discontinue treatment with any study therapy. Male patients should avoid impregnating a female partner. Male study patients, even if surgically sterilized, (i.e. post-vasectomy) must agree to one of the following: practice effective barrier contraception during the entire study treatment period and through 4 months after the last dose of study drug, or completely abstain from sexual intercourse