Isosorbide Dinitrate is a medication primarily used to treat and prevent chest pain, known as angina, in patients with coronary artery disease. It works by relaxing and widening blood vessels, which improves blood flow and reduces the heart's workload. This drug is often prescribed in tablet or sublingual form and may be taken regularly or as needed. Common side effects include headaches, dizziness, and flushing. Patients should follow their healthcare provider's instructions carefully to ensure safe and effective use.