In general, after drinking water before colonoscopy, you can take laxatives such as polyethylene glycol orally under the guidance of your doctor for bowel cleansing in preparation for colonoscopy; if you have already taken the laxatives and have completed the bowel cleansing preparations then it is not recommended to drink anything else after drinking water. Colonoscopy is a method of checking intestinal diseases, including colonoscopy and small bowel examination, of which colonoscopy is more commonly used. It is a method in which a doctor inserts a colonoscope through the anus to observe intestinal lesions or treat intestinal diseases from multiple angles and directions within the intestines. Bowel preparation refers to the need for patients to take laxatives to clean the bowel before colonoscopy, when the patient’s stool is watery stool indicates that the bowel preparation has been completed. Specific precautions before colonoscopy can be consulted with specialized physicians to avoid eating on their own, which may cause adverse consequences.