Gliclazide is a more common glucose-lowering drug, mainly used in patients with type 2 diabetes, and is usually taken 20-30 minutes before a meal. Gliclazide is a sulphonamide hypoglycemic agent, i.e. an insulin promoter, which binds to the sulphonylurea receptors in the body. About 20-30 minutes after taking the drug, the drug starts to act on the pancreatic beta cells, stimulating the cells to produce insulin, reducing the blood glucose spike after eating and achieving blood glucose control. Gliclazide has a risk of causing blood abnormalities, so it is important to have regular blood tests while taking the drug and to discontinue the drug immediately if abnormalities are found in the blood. In addition, the most common complication caused by Gliclazide is hypoglycemia, so patients must take the medication and eat regularly. When symptoms such as dizziness and panic occur, hypoglycemia should be corrected promptly to avoid more serious complications. In conclusion, diabetic patients should strictly follow medical advice, control their diet and exercise appropriately.