Condition analysis: The main mechanism of action of metformin is to inhibit hepatic glucose output. It can also improve the sensitivity of peripheral tissues to insulin and increase the uptake and utilization of glucose. The treatment of type 2 diabetes with metformin is also accompanied by weight loss, improvement of blood lipid profiles, enhanced fibrinolytic system activity, and reduced platelet aggregation, etc. It is considered that it may help delay or improve diabetic vascular complications. Opinions and suggestions: The adverse reactions include: 1. Gastrointestinal reactions: Take it with meals, starting with a small dose and gradually increasing the dose to reduce gastrointestinal adverse reactions; 2: Skin allergic reactions 3: Lactic acid poisoning. If any situation occurs during taking, please stop taking the medicine in time, but the chance of adverse reactions is relatively small, and the harm of diabetes is still relatively small compared with these symptoms, so it is still recommended that you take medicine regularly before blood sugar is corrected.