Xelmet XR 500 mg is an extended-release formulation of Metformin Hydrochloride, a biguanide class oral antihyperglycemic agent. It is primarily used to manage blood glucose levels in individuals with type 2 diabetes mellitus by decreasing hepatic glucose production, reducing intestinal glucose absorption, and enhancing insulin sensitivity. The extended-release formulation allows for once-daily dosing, improving patient compliance and reducing gastrointestinal side effects.