This document provides information on drugs used to treat diabetes mellitus. It discusses the types of diabetes, signs and symptoms, and effects of insulin on metabolism. It describes various insulin preparations including short-acting, intermediate-acting, and long-acting insulins. It also discusses oral hypoglycemic drugs including sulfonylureas, glinides, biguanides, thiazolidinediones, and alpha-glucosidase inhibitors. The goals of diabetes treatment are to maintain normal blood glucose levels, promote normal metabolism, prevent complications, and prevent hypoglycemia.