Question: is imdur the same as isosorbide mononitrate?
Answer: Imdur (isosorbide mononitrate) is a nitrate that dilates (widens) blood vessels, making it easier for blood to flow through them and easier for the heart to pump. Imdur is an extended release tablet used to prevent angina attacks (chest pain). Imdur will not treat an angina attack that has already begun.