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Isosorbide Mononitrate Oral tablet, extended release

It relaxes blood vessels, increasing the blood and oxygen supply to your heart

Generic Name: isosorbide mononitrate  |  Brand Name: ISMO

Brand Names: Isosorbide Mononitrate Extended Release, Monoket, Imdur, ISMO

What is this medicine?

ISOSORBIDE MONONITRATE (eye soe SOR bide mon oh NYE trate) is a vasodilator. It relaxes blood vessels, increasing the blood and oxygen supply to your heart. This medicine is used to prevent chest pain caused by angina. It will not help to stop an episode of chest pain.

What should I tell my health care provider before I take this medicine?

They need to know if you have any of these conditions:
  • previous heart attack or heart failure
  • an unusual or allergic reaction to isosorbide mononitrate, nitrates, other medicines, foods, dyes, or preservatives
  • pregnant or trying to get pregnant
  • breast-feeding

How should I use this medicine?

Take this medicine by mouth with a glass of water. Follow the directions on the prescription label. Do not crush or chew. Take your medicine at regular intervals. Do not take your medicine more often than directed. Do not stop taking this medicine except on the advice of your doctor or health care professional.

Talk to your pediatrician regarding the use of this medicine in children. Special care may be needed.

What if I miss a dose?

If you miss a dose, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double or extra doses.

What may interact with this medicine?

Do not take this medicine with any of the following medications:
  • medicines used to treat erectile dysfunction (ED) like sildenafil, tadalafil, and vardenafil

This medicine may also interact with the following medications:

  • medicines for high blood pressure
  • other medicines for angina or heart failure

What should I watch for while using this medicine?

Check your heart rate and blood pressure regularly while you are taking this medicine. Ask your doctor or health care professional what your heart rate and blood pressure should be and when you should contact him or her. Tell your doctor or health care professional if you feel your medicine is no longer working.

You may get dizzy. Do not drive, use machinery, or do anything that needs mental alertness until you know how this medicine affects you. To reduce the risk of dizzy or fainting spells, do not sit or stand up quickly, especially if you are an older patient. Alcohol can make you more dizzy, and increase flushing and rapid heartbeats. Avoid alcoholic drinks.

Do not treat yourself for coughs, colds, or pain while you are taking this medicine without asking your doctor or health care professional for advice. Some ingredients may increase your blood pressure.

What side effects may I notice from receiving this medicine?

Side effects that you should report to your doctor or health care professional as soon as possible:
  • bluish discoloration of lips, fingernails, or palms of hands
  • irregular heartbeat, palpitations
  • low blood pressure
  • nausea, vomiting
  • persistent headache
  • unusually weak or tired

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

  • flushing of the face or neck
  • rash

Where should I keep my medicine?

Keep out of the reach of children.

Store between 15 and 30 degrees C (59 and 86 degrees F). Keep container tightly closed. Throw away any unused medicine after the expiration date.

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.


Last Updated: July 26, 2010
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