- Ability to become pregnant (or already pregnant or lactating). Women and men who want to participate have to agree to use two highly effective forms of contraceptive prior to study entry, for the duration of study participation, and for 30 days following completion of therapy, to be eligible. Women of childbearing potential (WOCBP) must have a negative serum or urine pregnancy test (minimum sensitivity 25 IU/L or equivalent units of HCG) within 24 hours prior to the start of study drug.