- Women of childbearing potential (WCBP) must have a negative urine pregnancy test at screening (Visit 1). In addition, sexually active WCBP must agree to use two of the following adequate forms of contraception throughout the entire study (tubal ligation; intra-uterine device; barrier contraceptive with spermicide; or vasectomized partner). A WCBP must agree to have pregnancy tests 4 weeks after her last dose of lenalidomide. Due to the short duration of drug therapy, abstinence would also be a reasonable option.