- Patients who are pregnant or lactating. Females of childbearing potential must have a negative urine or blood pregnancy test at screening. Both men and women must be practicing an adequate method of birth control for the duration of the study. Acceptable methods of birth control include use of an intrauterine device (IUD), oral contraceptive pills, implanted, transdermal, or injected contraceptives, barrier methods with spermicide, and abstinence.