- Women of childbearing potential (WOCBP) must have a negative serum or urine pregnancy test (sensitivity > or = 25IU HCG/L) within 72 hours prior to the start of study drug administration. Persons of reproductive potential must agree to use and utilize an adequate method of contraception throughout treatment and for at least 6 months after study drug is stopped. Prior to study enrollment, women of childbearing potential must be advised of the importance of avoiding pregnancy during trial participation and the potential risk factors for an unintentional pregnancy.