Enteroscopy laxative generally use polyethylene glycol electrolyte dispersions, after drinking usually one hour to two hours to start defecation. In order to ensure that the colonoscopy vision, improve the detection rate of disease, to avoid leakage misdiagnosis, the examination before the need for adequate intestinal preparation, in advance of the use of intestinal cleansing agent, the most commonly used drugs for the polyethylene glycol electrolyte bulk, to do colonoscopy in the morning, for example, the evening before the examination need to start taking intestinal cleansing agent, specific can follow the instructions before the examination. During the medication, you can walk appropriately and slightly massage the abdomen to accelerate excretion, generally one hour to two hours after taking the medication, the intestinal movement is accelerated, and bowel movements begin to occur. But the specific time needs to be based on each person’s own situation, usually have constipation habits may need to extend the time. The standard of bowel preparation is to pass watery stools, and those who do not need to take more polyethylene glycol or water. Adequate bowel preparation can help to shorten the examination time and avoid misdiagnosis, so it is recommended that patients strictly follow the doctor’s instructions for bowel preparation.