I suffer from this as well, my doctor had me on a clear diet for 2 days. Then 2 laxatives and a gallon of Miralax the first day and then again the 2nd day. I was cleaned out. Due to the transverse colon revealed significantly excessive looping and a redundant colon the procedure was aborted. Having a redundant torturous colon causes problems with a colonoscopy. One of the risks is perforated bowel