Nitrolingual Spray is a sublingual spray used: for the treatment of sudden chest pain caused by coronary artery disease (acute angina attacks); as a preventive measure, taken immediately before physical exertion or other situations known to trigger sudden chest pain (angina attacks) (angina prophylaxis); in acute heart attacks; in acute heart failure (weak heart), with reduced function of the heart's left chamber (acute left heart failure); for catheter-induced narrowing of the coronary arteries (coronary spasms) during coronary angiography.