hi. i gave up the smokes in jan, noticed blood in my stool feb, colonoscopy in may,4 biopsies, diagnosis in june with ulcerative colitis. havent seen a gi yet but i was out on predfoam by the surgeon who carried out the c-scope. they dont cause any trouble because it absorbs into the rectum area very quickly. you dont have to hold them and let them go if thats what you're thinking like you would of with the prep for a c-scope.