Nitroglycerin Injection is a medication used primarily to treat chest pain, known as angina, and to manage heart conditions such as heart failure. It works by relaxing blood vessels, which improves blood flow and reduces the heart's workload. This can help alleviate symptoms associated with reduced blood supply to the heart. The injection is typically administered in a hospital setting, often through an intravenous (IV) line. Healthcare professionals monitor patients closely for any side effects, which may include headaches, dizziness, or low blood pressure. Proper dosage and administration are crucial for effectiveness and safety.