Metformin is generally not recommended when blood sugar is not high to avoid hypoglycemia. Metformin is a biguanide hypoglycemic drug, which can be used in the treatment of type 2 diabetes, or combined with insulin for the treatment of type 1 diabetes. In addition metformin can be used to improve insulin resistance in obese patients who do not have high blood glucose or in patients with insulin resistance. However, it is not recommended for patients without relevant indications. If blood glucose is not high, without the combination of obesity and insulin resistance, metformin is generally not recommended to avoid hypoglycemia. Adverse effects of metformin such as poor appetite, nausea, vomiting; rash, pruritus; lactic acidosis; and vitamin B12 deficiency may also occur. The use of Metformin needs to be under the supervision of a doctor and should not be used on its own.