Drinking laxatives before having a colonoscopy without a bowel movement needs to be treated under a doctor’s supervision by adjusting the dosage of the laxative, switching the type of laxative, or taking an enema. 1. Adjust the dose of laxatives. Before the colonoscopy, you need to start taking laxatives the night before, so as to empty the intestinal contents, so that during the colonoscopy, you can better observe whether there are lesions in the intestines. If there is no bowel movement after taking the laxative, the dose of the laxative may be insufficient to achieve the effect of bowel movement and diarrhea, and the dose of the laxative can be increased under the guidance of the doctor. 2. Change the type of laxative. If there is no bowel movement after taking the laxative, it may be that the patient is not sensitive to the laxative and thus cannot achieve a better bowel movement. It is recommended to change the laxative under the guidance of the doctor, you can choose other more sensitive types of laxatives for treatment. 3. Enema. If there is no bowel movement after taking the medication, the medication may not be effective for the patient. Can be treated by enema, mainly under the guidance of the doctor, the enema tube from the anus into the enema, and then injected into the enema solution for enema treatment, through the enema can play a softening and removal of feces. If you don’t have a bowel movement after taking laxatives before the colonoscopy, it is recommended that you consult a gastroenterologist in a timely manner and under the guidance of a doctor for symptomatic treatment.