According to the specification of 500mg/tablet, the dosage of Metformin for patients with postprandial blood glucose of 15.0mmol/L can be 1~3 tablets/day, divided into 2~3 oral doses, and the maximum dosage is usually not more than 4 tablets/day. Patients who need to take metformin, the specific daily take a few tablets of metformin need to be a professional physician to assess the condition after the development of drug treatment program. Metformin is a biguanide hypoglycemic drug, which lowers blood sugar by inhibiting hepatic glucose output, improving the sensitivity of peripheral tissues to insulin, and increasing the uptake and utilization of glucose by peripheral tissues. Close monitoring of blood glucose is required while taking the drug. Metformin should not be taken without authorization in order to avoid adverse effects, and it is recommended that patients go to the endocrinology department of a regular hospital for detailed consultation and take the medicine as prescribed by the doctor.