- Male subjects must agree to use a latex condom during any sexual contact with females of child bearing potential (FCBP) during study drug treatment, during dose interruptions, and for at least 28 days following discontinuation of study drug even if they have undergone a successful vasectomy. Counseling about the requirement for latex condom use during sexual contact with FCBP and the potential risks of fetal exposure must be conducted at a minimum of every 28 days.