After three days of taking hypoglycemic drugs, how much blood glucose can be reduced is not certain, it varies from person to person, daily monitoring of blood glucose is recommended. There are many types of oral hypoglycemic drugs, such as metformin, acarbose, glimepiride, gliclazide, dagliflozin, empagliflozin, cagliflozin, etc. The time for the effect of each drug to be effective may be different, and the condition of each patient is different, so the effect of lowering glucose after taking it for three days cannot be generalized. Patients should monitor their blood glucose on a daily basis and go to the hospital for regular checkups to comprehensively assess the effect of glucose-lowering treatment. It is recommended that patients take the medication under the guidance of a doctor, have regular checkups, and control their blood glucose by combining dietary control and appropriate exercise.