Alcohol is not recommended for people with high blood sugar. Generally, you need to stop taking metformin for a week before you can drink alcohol while taking the medication. Patients with high blood sugar cannot stop taking the drug on their own. Metformin is a glucose-lowering drug mainly used to treat type 2 diabetes, and alcoholic beverages can affect the effect of metformin when consumed and also increase the risk of lactic acidosis. Alcohol consumption is detrimental to blood glucose stabilization, and hypoglycemic reactions may occur with heavy alcohol consumption, leading to serious consequences. Common adverse reactions to metformin include gastrointestinal reactions, skin irritation, and lactic acidosis, and it is contraindicated in patients with severe comorbidities, alcoholism, and severe renal insufficiency. Therefore, alcohol is not recommended for patients with high blood sugar, and you need to stop taking metformin for a week before you can drink alcohol. Patients with high blood sugar need to take medication under the guidance of the doctor, and can not stop taking medication by themselves. If there is any discomfort, consult a doctor in time.