Metformin can be used to treat diabetes and is not a treatment for hair loss. Metformin, in combination with diet and exercise therapy, or with sulfonylurea hypoglycemic drugs, etc., can control blood sugar in patients with type 2 diabetes, but usually does not treat hair loss. Symptoms such as diarrhea, nausea, vomiting and other discomforts may occur during the use of the medication, and most of them disappear when the medication is discontinued. The drug is contraindicated in patients with renal disease or renal insufficiency caused by cardiovascular failure, acute myocardial infarction and sepsis, severe infections, trauma, major surgery. Elderly patients should pay attention to regular testing of renal function during the use of the drug. Note that the drug should be used under the guidance of a doctor, avoid unauthorized use of drugs to avoid adverse effects. If there are persistent symptoms that can not be relieved during the use of the drug, it is recommended to consult a doctor in a timely manner, improve the relevant examination, clarify the cause of the disease and standardize the treatment.