Imdur Tablet is used to prevent and manage chest pain (angina) caused by coronary artery disease. It works by relaxing and widening blood vessels, allowing for better blood flow to the heart. Imdur Tablet works by widening the blood vessels and increasing the blood flow to the heart. Take this medicine in the exact dose and duration recommended by your doctor. Do not take more than the prescribed dose. Do not stop taking this medicine on your own. Find patient medical information for Isosorbide Mononitrate ( Imdur , Ismo, others) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Isosorbide mononitrate is a prescription drug indicated for the prevention of angina pectoris due to coronary artery disease. Learn about side effects, dosage, drug interactions, and more.