A successful prep is when your bowel movement is a clear yellow liquid. Seven (7) days before your procedure: STOP: OKAY/APPROVED: 1. Aspirin unless prescribed by a physician 2. pressure and/orNSAIDS including: Ibuprofen (Motrin, Advil), Naproxen (Aleve, Naprosyn), and similar medications 3. All seeds, nuts, popcorn, Iron supplements.