Drinking expired drinks stomach pain is due to expired drinks there is food contamination, the patient’s intestinal intolerance to expired drinks ingredients, the patient itself intestinal flora disorders and other causes of acute gastroenteritis, can be treated with medication, commonly used norfloxacin, montelukast and other drugs. 1. Food contamination: expired drinks have bacterial contamination, which can induce infectious acute gastroenteritis. Norfloxacin can be taken as prescribed by the doctor for anti-infection treatment. 2. Intolerance to beverage ingredients: If expired beverages deteriorate and produce a lot of acid, it will damage the intestinal mucosa and trigger non-infectious acute gastroenteritis. You can take antidiarrheal drugs such as montelukast as prescribed by your doctor. 3. Intestinal flora disorders: patients with intestinal flora disorders, expired beverages in the intestinal tract by the abnormal fermentation of harmful flora, so that the intestinal gas production increased, peristalsis increased, abdominal pain and bloating and other symptoms. Can follow the doctor’s advice to take montelukast, bifidobacteria and other drugs to relieve symptoms, adjust the flora. If the stomach pain continues to be unrelieved, you need to consult a doctor in time and follow the doctor’s instructions for medication.