You need have clear liquids for 6 hours prior to the CT, and then about an hour before they give you this contrast stuff to drink...about three 12 oz. glasses full. It's not near as bad as a colonoscopy prep, and doesn't taste as bad as the barium. I had terrible diarrhea afterward, but I was having terrible D beforehand, and the CT prep stuff just made it worse! Later I found out that I had Salmonella, so all the D may not have been related to the prep. Good Luck as Cleveland Clinic, and fill us in on how it went.
49 yr. old female, diagnosed with Crohn's in small intestine and terminal ileum Sept-Oct. 2007
currently taking Pentasa 2750 mg- 9pills/day and on and off Prednisone for flares