- If male and non-vasectomized, must agree to use a condom with spermicide or abstain from sexual intercourse during the study until 30 days beyond the last dose of study drug. No restrictions are required for a vasectomized male provided his vasectomy has been performed 4 months or more prior to first dose of study drug. A male who has been vasectomized less than 4 months prior to study start must follow the same procedure as a non-vasectomized male.