Alcohol consumption is not recommended for taking metformin, especially not sudden or prolonged excessive alcohol consumption, because studies have shown that alcohol can affect the effect of metformin on lactic acid metabolism. Metformin belongs to the hypoglycemic drugs, it can help diabetic patients to reduce fasting and postprandial blood glucose, maintain blood glucose stability, the efficacy of better. However, metformin can also bring side effects, such as lactic acidosis and gastrointestinal reactions. Alcohol consumption may affect lactic acid metabolism and increase the possibility of lactic acidosis. Metformin is more irritating to the gastrointestinal tract, and alcohol is equally irritating to the gastrointestinal tract. If you take metformin and drink alcohol at the same time, the gastrointestinal tract is doubly irritated, and the damage to the gastrointestinal tract will be even more severe. Therefore, it is best not to drink alcohol while taking Metformin. Patients should take metformin under the guidance of a doctor, not blindly use the drug.