Fasting blood glucose 18mmol/L in a 65-year-old man is required to take medication. The normal range of fasting blood glucose should be 3.9~6.1mmol/L, 65 years old man fasting blood glucose 18mmol/L is much higher than the normal value, if not timely intervention, it will lead to a variety of complications, such as triggering diabetic ketoacidosis, cardiovascular and cerebral vascular lesions, neuropathy, retinopathy and so on. It needs to be controlled by hypoglycemic drugs such as glibenclamide and metformin, and may even require insulin injection to control blood glucose. After taking medication for 65 year olds with fasting blood sugar 18mmol/L, they also need to pay attention to their diet, control the total calories in their daily diet, and avoid foods that are high in fat, high in calories, high in sugar, and high in salt. You can do aerobic exercise in moderation every day, which can increase the sensitivity of the body to insulin. 65-year-old people with fasting blood glucose 18mmol / L need to consult a doctor in time, by the doctor according to the specific condition to give the correct treatment program.