Acarbose is an alpha-glucosidase inhibitor, a glucose-lowering drug, and is commonly used in the clinical treatment of type 2 diabetes. Acarbose is suitable for: 1. Type 2 diabetes whose blood glucose cannot be satisfactorily controlled by diet therapy alone, especially postprandial blood glucose. 2. Those with reduced glucose tolerance, which is currently approved by the FDA, for use in prediabetes. 3. Type 2 diabetes patients who apply sulfonylurea oral hypoglycemic agents or biguanide oral hypoglycemic agents with unsatisfactory efficacy, especially when postprandial blood glucose control is poor, can be added. 4. As an adjuvant therapeutic drug to insulin, it can reduce the dosage of insulin and stabilize blood sugar. Acarbose also has its side effects, such as abdominal distension, hyperactive bowel sounds, excessive exhaustion, and even diarrhea. It is clinically prohibited for people with intestinal inflammation, serious abnormalities of liver and kidney function, etc. In conclusion, acarbose is widely used and applied in the treatment of type 2 diabetes, which is safe and effective, but it is also important to pay attention to its adverse effects and contraindications.