- All patients must be counseled about pregnancy precautions, risks of fetal exposure and other risks. The counseling must be done before the initiation of the study and every 28 days before the study drug is dispensed to the subject. FCBP must either commit to continued abstinence from heterosexual intercourse or begin TWO acceptable methods of birth control, one highly effective method and one additional effective method AT THE SAME TIME, at least 28 days before she starts taking lenalidomide. FCBP must also agree to ongoing pregnancy testing. Men must agree to use a latex condom during sexual contact with a FCBP even if they have had a successful vasectomy. See Appendix D: Risks of Fetal Exposure, Pregnancy Testing Guidelines and Acceptable Birth Control Methods.