The main reason for taking hypoglycemic drugs is to be able to lower the concentration of blood glucose in the blood, thus lowering the level of glycated hemoglobin. There are many types of hypoglycemic drugs with different mechanisms of action, all of which can control elevated blood glucose and stabilize blood glucose. Glycosylated hemoglobin is the product of a non-enzymatic reaction between glucose and protein in the blood, reflecting the average value of blood glucose in the last 2-3 months. Diabetic patients need to take glucose-lowering medication for a long period of time in order to better control their blood glucose at a normal level, thus keeping their glycosylated hemoglobin in the desired range. On the contrary, if a diabetic patient does not control his/her blood glucose regularly for the last 2-3 months, it will raise the glucose in the blood, which in turn will raise the level of glycosylated hemoglobin. Diabetic patients are advised to take proper treatment under the guidance of their doctors.