Taking metformin usually allows you to drink milk and usually does not affect the efficacy of the drug. Metformin is used for the treatment of type 2 diabetes mellitus in which simple diet and physical exercise are ineffective in controlling blood glucose, and the proteins, trace elements and other components in milk usually do not react with metformin, so you can usually drink milk. Adverse reactions such as bleeding nausea, vomiting, diarrhea, abdominal pain and loss of appetite may occur after taking metformin, and can mostly be relieved on their own. Adverse reactions such as lactic acidosis, taste disturbances, abnormal liver function, hepatitis, erythema, pruritus, and urticaria may also occur. Patients with serious adverse reactions should seek prompt medical attention. It is used with caution in hypoxia and renal insufficiency, and is contraindicated in children under 10 years of age, pregnant women, lactating women, those who are allergic to the product, and patients with acute and unstable heart failure. Patients who want to take Metformin are advised to go to a regular hospital, consult a professional doctor, cooperate with the doctor to complete the relevant examinations, and avoid blind use of drugs.