Anril SR 2.6mg Tablet is a sustained-release formulation of Nitroglycerin, a nitrate-based vasodilator. It is primarily used for the prophylaxis (prevention) of chronic stable angina pectoris—a condition characterized by chest pain due to reduced blood flow to the heart muscle. By dilating blood vessels, Nitroglycerin reduces the heart's workload and improves blood flow, thereby alleviating angina symptoms.