In this randomized controlled trial in hospitalized patients, patients in whom colonoscopy was anticipated the day following EGD were consented and randomized to either standard prep by mouth (split-dose PEG) or intervention group (instillation of the first 2 liters of Nulytely solution through the channel of the endoscope into the duodenal bulb, then continue standard prep). Data is collected on quality of prep and patient satisfaction in both groups.