Anti-diabetic medications treat diabetes mellitus by lowering glucose levels in the blood. With the exceptions of insulin,exenatide and pramlintide, all are administered orally and are thus also called oral hypoglycaemic agents or oral antihyperglycemic agents. There are different classes of anti-diabetic drugs, and their selection depends on the nature of the diabetes, age and situation of the person, as well as other factors.A number of drugs are available to help manage type 2 diabetes. Depending on the severity of the condition, drugs are usually used in conjunction with other monitoring and treatment options.