Isosorbide Mononitrate

Isosorbide mononitrate is used to prevent angina attacks (chest pain). It works by relaxing the blood vessels. When blood vessels are dilated, it is easier for the heart to pump. Also, more blood, which is rich in oxygen, can flow to the heart.

Important Information about Isosorbide Mononitrate

Always sse this medication exactly as prescribed by your doctor. You may develop a headache because of this medicine, but do not stop taking it. Take aspirin or acetaminophen to treat the headache. Avoid consuming alcohol while taking this medication.

Do not stop taking Isosorbide Mononitrate suddenly. Stopping suddenly could cause a severe angina attack.

Before taking this medication, tell your doctor if you

  • have had a heart attack;
  • have congestive heart failure;
  • have low blood pressure;
  • have had a stroke, a transient ischemic attack (TIA, or mini-stroke), or a serious head injury;
  • have anemia;
  • have an allergy to nitrates;
  • have closed-angle glaucoma;
  • suffer from migraines;
  • have kidney disease; or
  • have liver disease.

Isosorbide Mononitrate Side Effects

Serious side effects include:

  • An allergic reaction – difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives;
  • blurred vision or dry mouth; or
  • irregular heartbeat;
  • fainting.

Common side effects include:

  • Headache, dizziness, or weakness;
  • flushing (redness of the face, neck, and chest);
  • nausea or vomiting;
  • a fast heartbeat;
  • swollen ankles.

This information is advisory only. It does not contain all information about this medication. If you have any questions about Imdur, ask your doctor, pharmacist, or health care provider.

Online Pharmacies Canada, a Canadian Internet-based pharmacy intermediary (license #BC X23),offers long term prescription drugs for low cost canadian online pharmacy prices. Online Pharmacies Canada facilitates the review of your prescription drugs and your general health. We forward all prescriptions to affiliated CIPA certified licensed Canada pharmacies to be filled. A professionally registered pharmacist fills all discount canadian prescriptions.

For more information on how you can order your drugs from Canada call 1-877-536-8162 or visit

Information provided on this website is for general purposes only. It is not intended to take the place of advice from your practitioner