Nitrofix SR 2.6 mg Tablet is a sustained-release medication manufactured by Opsonin Pharma Ltd. in Bangladesh. It contains Nitroglycerin (also known as Glyceryl Trinitrate), a nitrate used to prevent and treat angina pectoris (heart-related chest pain). This formulation works by relaxing and widening blood vessels, thereby reducing the heart's workload and improving blood flow.