Imdur (Isosorbide Mononitrate ER) Customer Reviews


Rx Prescription Required    RxFormulation : Extended Release Tablet

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Generic alternative for Imdur

Isosorbide Mononitrate ER

Rx Prescription Required    RxFormulation : Tablet

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Isosorbide mononitrate belongs to a class of drugs called nitrates, and it is used to prevent chest pain, also known as angina, in patients with coronary artery disease. Its mechanism of action involves relaxing and widening blood vessels, thus increasing blood flow to the heart. This medication does not alleviate chest pain once it has occurred and is not intended for use just before physical activities that may trigger chest pain, such as exercise or sexual intercourse.

Uses and Dosage

Follow your doctor’s instructions and take this medication orally, usually once a day upon waking up. Swallow the medication whole with a half glass of water (4 ounces/120 milliliters), unless advised otherwise by your doctor. Do not chew or crush the medication, as doing so may cause all of the drug to be released at once, increasing the risk of side effects.

Do not divide the tablets unless they have a score line, and only do so if advised by your doctor or pharmacist. If you must divide the tablet, swallow the whole or split tablet without crushing or chewing.

To get the most benefit from this medication, use it regularly and at the same time each day to help you remember. Do not stop taking it without consulting your doctor, as some conditions may worsen when the drug is abruptly discontinued. Your dosage may need to be gradually decreased.

While it is unlikely, long-term use of this medication may result in reduced effectiveness, requiring different dosing.

If you experience more frequent or worsening chest pain, inform your doctor immediately.

Side Effects

Some side effects may occur that usually do not need medical attention:

  • abdominal pain
  • constipation
  • diarrhea
  • dizziness or lightheadedness, especially when rising from a lying or sitting position
  • flushing of face and neck
  • gas
  • headache
  • increased sweating
  • nausea
  • restlessness
  • sensation of spinning
  • trouble sleeping

Inform your healthcare provider immediately if you experience any serious side effects:

  • blurred vision
  • chest pain
  • heartburn
  • rapid or pounding heartbeat
  • severe or prolonged headache


Inform your doctor or pharmacist of any allergies you have, including allergies to this medication, similar drugs such as isosorbide dinitrate or nitroglycerin, or any other allergies you may have. This product may contain inactive ingredients that could cause allergic reactions or other complications.

Before taking this medication, disclose your medical history to your doctor or pharmacist, particularly if you have low blood pressure.

This medication may cause dizziness. Consumption of alcohol or marijuana may intensify the dizziness. Avoid driving, operating machinery, or performing any activities that require alertness until you can do so safely.

Older adults may be more susceptible to the side effects of this medication, particularly dizziness and lightheadedness, which may increase the risk of falls.

This medication should be used during pregnancy only when it is absolutely necessary. Discuss the risks and benefits with your doctor.

It is uncertain if this medication passes into breast milk. Speak with your doctor before breastfeeding.

Form and Strength

Imdur is available in the following forms and strengths:

  • Imdur extended-release tablet:

    • 30mg
    • 60mg
    • 120mg
  • isosorbide mononitrate tablet:

    • 30mg
    • 60mg
    • 120mg


How long does it take for Imdur to start working?

The tablets and capsules usually start to work within 1 hour.

Should you take Imdur on an empty stomach?

Take this medication on an empty stomach, at least 30 minutes before or 2 hours after food.



Additional information

Generic name:

Isosorbide Mononitrate, Isosorbide Mononitrate ER, Isosorbide Mononitrate PR


ER Tablet, Extended Release Tablet, Extended ReleaseTablet, Tablet


30mg, 60mg, 120mg

Quantities Available:

30, 90

Can Drug Store has provided information from third parties intended to increase awareness and does not contain all the information about Imdur (Isosorbide Mononitrate ER). Talk to your doctor or a qualified medical practitioner for medical attention, advice, or if you have any concerns about Imdur (Isosorbide Mononitrate ER).