You can’t drink milk before having a colonoscopy, you need to empty your intestines before having a colonoscopy and then you can’t eat again. You can’t drink milk before having a colonoscopy, milk is indigestible and produces gas easily. Before doing colonoscopy, you need to do intestinal treatment to empty the feces, the main purpose is to avoid the possibility of misdiagnosis when the feces covers the intestinal mucosa during the examination. After the colonoscopy, without any problems or specific diseases, you can drink less milk in moderation. Colonoscopy is an invasive examination, stimulate the intestinal mucosa, and cause abdominal pain or bloating and other symptoms, colonoscopy is generally required to prohibit eating and drinking within 2 hours after the examination, if there is no discomfort after 2 hours, you can eat fluids or semi-fluid food. After colonoscopy, avoid eating spicy and stimulating food, greasy and indigestible food. If you have any discomfort after colonoscopy, you should consult a doctor in time and follow the doctor’s requirements strictly.