Doing colonoscopy drinking laxatives too hard to drink also can not add white sugar. Laxatives before colonoscopy, such as polyethylene glycol electrolyte bulk, is a kind of osmotic laxative, mainly through the maintenance of high osmotic pressure in the intestinal lumen, so that the patient in a short period of time diarrhea, to play the role of intestinal cleansing, to avoid fecal matter and other intestinal contents to affect the examination field of view, resulting in missed diagnosis and misdiagnosis. Doing colonoscopy drinking laxatives is too difficult to drink, if you add sugar, may have a certain effect on the efficacy of laxatives, may change the osmotic pressure of laxatives, resulting in poor intestinal cleansing effect, at this time you need to add a laxative dosage, so as to play a normal intestinal cleansing effect, so it is more likely to cause discomfort to the patient and other situations, so it is not recommended that laxatives add sugar to take. It should be noted that the laxatives for colonoscopy should be taken under the guidance of a doctor, follow the doctor’s instructions, and should not be used without authorization.