Nitrodel Tablet, containing the active ingredient Alpha Ketoanalogue (NA), is a prescription medication primarily indicated for the treatment of angina pectoris (chest pain due to heart disease). It works by dilating (widening) blood vessels, which improves blood flow to the heart, reducing the severity and frequency of anginal attacks. The tablet's rapid onset of action makes it useful for immediate relief in acute situations. However, it's essential to note that Nitrodel Tablet should be used under a doctor's supervision due to its potential for habituation and the need for gradual dosage adjustments to prevent rebound angina. Common side effects include headache, dizziness, and hypotension (low blood pressure). Patients with certain conditions, such as severe anemia, untreated hypotension, or chronic obstructive pulmonary disease (COPD), should exercise caution when using this medication.