Imdur (isosorbide mononitrate) is in a group of drugs called nitrates. It dilates (widens) blood vessels, making it easier for blood to flow through them and easier for the heart to pump.
Take Imdur exactly as prescribed by your doctor.
Take this medication with at least 4 ounces of water or other liquid. Do not crush, chew, or break an extended-release tablet. Swallow the pill whole.
If possible, try to rest or stay seated when you use this medication. Imdur can cause dizziness or fainting. Use Imdur regularly to prevent an angina attack.
Do not stop taking Imdur suddenly. Stopping suddenly could cause a severe angina attack.
The usual adult dose of Imdur is 30-60 mg orally once a day. Follow your doctor's dosing instructions very carefully.
Store this medicine at room temperature away from moisture, heat, and light. Keep the bottle tightly closed when not in use.