It is generally better not to drink cola after taking a laxative before having a gastroenteroscopy. Gastroenteroscopy refers to the use of gastroscopy and enteroscopy through the lens into the digestive tract, visual observation of the digestive tract lining of the examination means, before doing gastroenteroscopy, generally need to eat laxatives, so that the gastrointestinal tract of feces, food residues as soon as possible, so as not to stick in the digestive tract impede the gastroenteroscopy of the line of sight, gastroenteroscopy eaten laxative generally do not drink coke before doing gastroenteroscopy is better. Before doing gastroenteroscopy need to pay attention to fasting, no water for a period of time, the stomach and intestines of the microscopic requirements are slightly different, after eating laxatives, before doing gastroenteroscopy, if you drink cola, violating the precautions of gastroenteroscopy, gastroenteroscopy will have an adverse effect on the examination, therefore, generally speaking, do gastroenteroscopy before taking laxatives do not drink cola is better.