Ranolaz OD Tablet is used alone or with other medicines to treat angina pectoris. Angina pectoris is discomfort in the chest or chest pain, which generally occurs due to coronary artery disease (CAD) when an adequate amount of oxygen and blood is not reaching the heart and its muscles. It can also be due to the blockage of the heart's arteries. It helps prevent any further attack of angina by making the heart work more efficiently, and it is used as an add-on to existing treatment in patients whose disease is not adequately controlled by other medicines for angina pectoris, such as beta-blockers or calcium antagonists, or in patients who cannot take these medicines.