This document summarizes different classes of oral antidiabetic drugs for primary care physicians. It describes biguanides like metformin, sulfonylureas like glibenclamide, alpha-glucosidase inhibitors like acarbose, and thiazolidinediones like pioglitazone. For each class, it provides information on indications, dosing, contraindications, and other details relevant to prescribing the drugs for treatment of type 2 diabetes. The document also lists additional resources on oral antidiabetics.