I am seeing my gastro doc next week for ongoing issues I have been having with my intestines ( pain, tendernness, cramping all the time). I am likely going to ask him to do a colonoscopy. I had a colonoscopy before like 7 o 8 years ago and drank that gallon of stuff the day before. Well since then I am now allergic to Polyethelne glycol which is the ingrediant in the moviprep or golytely, and those other preps. What other preps are there that are safe and effective?? I absolutely cannot do stimulent types of laxatives or enemas. They cause me severe pain and cramping. A couple years ago I had a bout with constipation and used just a warm water enema and OMG, I was in agony for hours!! I told my GI nurse about it and she said some people cannot handle the stimulant effect. I need something that is similar to the gallon crap they make you drink as it did not cause me any pain or anything, but it cannot contain any polyethelne glycol.. Any ideas? I figure I need to research myself so that if he does want me to have the colonoscopy I have to be able to tell him what to prescribe me. I looked online and there were a couple of things mentioned, but I would like to know if any of you on here were not able to take the polyethelene glycol due to allergic reaction, what did you take for the prep??