Comparison of Oral Lactulose Versus Polyethylene Glycol for Bowel Preparation in Low-risk Patients

In the LOS group, patients were instructed to drink 200ml lactulose (Duphalac, Olst, the Netherlands; 200ml/bottle) diluted with clear water into 1L 4-6h before colonoscopy at a rate of 250ml every 30min.

patient in the PEG group were instructed to drink 2L of PEG (each liter containing 59g PEG 4000, 1.46g sodium chloride, 5.68g sodium sulfate, 0.74g potassium chloride, 1.68g sodium bicarbonate; WanHe Pharmaceutical Co, Ltd., China) 4-6h before colonoscopy at a rate of 250ml every 15min