Isosorbide dinitrate is a nitrate that dilates (widens) blood vessels, making it easier for blood to flow through them and easier for the heart to pump.
Isosorbide dinitrate is used to treat or prevent attacks of chest pain (angina).
Only the sublingual tablet should be used to treat an angina attack that has already begun.
Isosorbide dinitrate regular and extended-release tablets are used to prevent angina attacks but will not treat an angina attack.
Isosorbide dinitrate may also be used for purposes not listed in this medication guide.
