Fasting blood glucose of 8.4mmol/L and 2-hour postprandial blood glucose of 10.5mmol/L in diabetic patients after taking Metformin Hydrochloride Tablets are high and abnormal. The normal range of fasting blood glucose in diabetic patients is generally required to be between 4.4 and 7.0 mmol/L, while the normal range of blood glucose 2 hours after meal should be less than 10 mmol/L. Therefore, the fasting blood glucose of 8.4 mmol/L and the blood glucose of 10.5 mmol/L 2 hours after meal after taking metformin hydrochloride tablets belong to high and abnormal. Patients with high fasting and post-prandial blood glucose after taking glucose-lowering drugs may not have active dietary control, and should maintain a low-salt, low-sugar and low-fat diet in daily life, with appropriate exercise; they may also be caused by insufficient dosage of medication, and it is recommended that they go to the hospital and adjust the dosage of medication under the guidance of the doctor. Diabetic patients with poor blood glucose control are recommended to go to the hospital.