This document discusses antidiabetic drugs used to treat diabetes mellitus. It covers types of insulin preparations including rapid, short, intermediate, and long acting insulins. It also discusses classes of oral antidiabetic drugs including sulfonylureas, meglitinide analogues, biguanides, thiazolidinediones, and alpha-glucosidase inhibitors. Side effects are provided for each drug class. Therapeutic uses include treatment of type 2 diabetes alone or in combination with insulin, but not for type 1 diabetes.