Metformin is a biguanide glucose-lowering drug. Metformin is used for patients with type 2 diabetes whose blood glucose cannot be effectively controlled by diet and physical exercise alone; for patients with type 1 or type 2 diabetes, combining with insulin can increase the glucose-lowering effect and reduce the dosage of insulin, and so on. Diarrhea, nausea, vomiting, abdominal distension, generalized weakness, lactic acidosis, dysgeusia, rash, dizziness, weight loss, etc. may occur in some patients after taking Metformin. This product is contraindicated in severe renal insufficiency, severe infection, trauma, allergy to metformin, acute alcoholism, metabolic acidosis, etc.. It is recommended that patients should take Metformin under the guidance of a specialist and not self-medicate to avoid serious adverse reactions.