[15] All subjects were instructed to consume a low-fiber diet for 2 days prior to colonoscopy and were given the option of consuming a PEG-based preparation using one of the following dosing ...

A variety of PEG-based bowel preparations are now ... the most widely used bowel preparation for colonoscopy in Canada and the UK, is expected to be approved in the USA in the near future.

You must drink the second half of the polyethylene glycol preparation either later that same night for a morning colonoscopy or the next morning for an afternoon colonoscopy. A healthcare provider ...