- Pregnant or nursing women may not participate. Women of childbearing potential must have a negative pregnancy test documented within 10 to 14 days of enrollment. Women/men of reproductive potential may not participate unless they have either agreed to practice true abstinence, when this is in line with the preferred and usual lifestyle of the participant. (Periodic abstinence [eg,calendar, ovulation, symptothermal, post-ovulation methods] and withdrawal are not acceptable methods of contraception.) OR begin TWO reliable methods of birth control: 1 highly effective method and 1 additional effective method AT THE SAME TIME, at least 28 days before starting study treatment through 30 days after the last dose of study treatment.