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Bowel preparation is inadequate in up to 25% of patients undergoing colonoscopy. The ideal bowel preparation regimen would effectively clean the colon while minimizing patient discomfort. To compare 4L of polyethylene glycol (PEG) alone to PEG+ four 5 mg oral bisacodyl tablets (PEG+ B) as bowel preparation for colonoscopy. Between 2/2006 and 11/2007 we prospectively collected information about English-speaking patients undergoing screening colonoscopy at a large urban academic medical center. Data was obtained as part of an ongoing, randomized trial to improve bowel preparation using a visual aid included with preparation instructions. In 12/2006, our endoscopy unit’s standard bowel preparation regimen was changed from PEG to PEG+ B. For this analysis, our primary endpoint was the percentage of patients in each preparation group receiving a qualitative bowel …