Jetoprol-XL 12.5 contains Metoprolol Succinate, an extended-release beta-blocker used to manage certain cardiovascular conditions, including high blood pressure, angina (chest pain), and some heart conditions. It works by slowing the heart rate and reducing the workload on the heart. The extended-release formulation helps provide a sustained effect. Use this prescription medicine only under the supervision of a qualified healthcare professional, and do not stop taking it suddenly without medical advice.