Nitroglycerin is in a group of drugs called nitrates. Nitroglycerin dilates (widens) blood vessels, making it easier for blood to flow through them and easier for the heart to pump. Nitroglycerin topical (for the skin) is used to prevent attacks of chest pain (angina). Nitroglycerin topical may also be used for other purposes not listed in this medication guide.
Nitro-Bid is a nitroglycerin ointment that is used to treat chest pain associated with coronary artery disease. Nitro-Bid belongs to a group of drugs called nitrates. It works by widening and relaxing blood vessels, providing sufficient oxygen to the heart.