.Gliclazide 40 mg Tabs is used to lower the blood sugar levels in type 2 diabetes mellitus when diet, physical exercise and weight reduction alone are not adequate. It is used along with diet and exercise to improve blood sugar control in adults with type 2 diabetes. is an antidiabetic medication. It works by increasing the amount of insulin released by the pancreas in order to lower the blood sugar levels. Be careful while driving or operating machinery until you know how Gliclazide affects you. Take Gliclazide before meals or exactly as instructed by your doctor. There is evidence stating that Gliclazide works best at controlling post meal high blood sugar levels when taken 30 minutes before breakfast. Take as directed by physician.