The number of bowel movements after taking laxatives before colonoscopy is generally 3-6 times, which varies from person to person due to some individual differences. Whether or not the bowel preparation is up to standard after drinking laxatives before colonoscopy cannot be judged by the number of bowel movements, and it is necessary to observe that the feces appear clear and watery, and the bowel preparation is considered to be up to standard. Some patients start to defecate in about half an hour after drinking the laxative, and the bowel movement can be completed after 3 to 4 times, while some patients may need 5 to 6 times or even more. If the patient is chronically constipated, it is necessary to increase the amount of laxative taken as well as extend the bowel preparation time. In fasting patients or patients who have eaten less in recent days, there may be less than 3 bowel movements and bowel preparation can be achieved. Laxatives are required for colonoscopy in order to clear the bowel so that fecal debris can be removed from the bowel, allowing the specialist to observe the intestinal mucosa as well as the specifics of the lesion. In addition, the consumption of laxatives, there is a certain degree of risk, the patient needs to be under the guidance of a specialist .