MiraLAX® and Dulcolax® are “over the counter” so you do not need a prescription. If you take blood thinners, such as warfarin (Coumadin®), enoxaparin (Lovenox®), apixiban (Eliquis®) or clopidogrel (Plavix®), call the provider who prescribed your medications and tell them you are having a colonoscopy and the date of the procedure.