I've had both a colonscopy and an endoscopy. Everything was perfectly clear and fine (because it was my gall bladder, not my colon that I was having problems with). Get some baby wipes for your bum, because the toilet paper will rub you raw pretty fast. Staying on the toilet all day, wasn't the worst of it. I about went crazy over the all-liquid diet. I was much more preoccupied with food than with the diarrhea. Oh, and the horrible swill I had to drink. If I had it to do all over again, I'd tell my doctor that it's the laxative pills or no scope. All doctors prefer one laxative over another, be it the pills, the GoLyghtly swill or the Fleets Phospho Soda. For every doctor that says the pills don't work, there's another one that swears by them, so who cares what your doctor likes or doesn't like; make the laxative pills an absolute requirement for your doing the procedure. The GoLyghtly is just absolutely nausating. I've heard the Phospho Soda is nasty too, but you don't have to drink anywhere near so much of it, which makes it slightly better. Pico Salax, which as far as I know, is still only available in Canada, is supposed to taste just like Tang and actually taste good, so it is a viable alternative. If I couldn't get the pills, I'd certainly order some Pico Salax from a Canadian pharmacy. No more GoLyghtly for me ever again in my lifetime!!!