How long can you drink water after colonoscopy should be analyzed according to the purpose of the patient’s colonoscopy and the symptoms after the colonoscopy, etc. If the patient is only undergoing colonoscopy, and there are no symptoms of abdominal distension, abdominal pain, etc. after the examination, he/she can drink water about 1 hour after the examination. If the patient only underwent colonoscopic observation without relevant surgery and biopsy, and there were no symptoms such as abdominal distension and abdominal pain after the examination, he/she could drink water 1 hour after the examination. If the patient has undergone corresponding treatment during the colonoscopy, such as colon polypectomy, etc., the time for eating and drinking water should be appropriately prolonged, and the specific time should be determined by the professional doctor according to the actual situation of the patient after the operation. It is recommended that after colonoscopy, patients should strictly follow the doctor’s instructions on food and water intake, and communicate with the doctor in time when abnormal reactions occur, so as to carry out the corresponding treatment.