Imdur (Isosorbide Mononitrate ER)


(Brand Option)

Prescription RequiredPrescription Required
FormulationFormulation: Extended Release Tablet
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$67.00 ($0.74 per tablet)

$59.50 ($1.98 per tablet)

$122.00 ($1.36 per tablet)

$77.00 ($2.57 per tablet)

$221.00 ($2.46 per tablet)

Isosorbide Mononitrate ER

(Generic Alternative)

Prescription RequiredPrescription Required
FormulationFormulation: Extended ReleaseTablet, ER Tablet, Tablet
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$64.00 ($0.71 per tablet)

$70.00 ($0.78 per tablet)

$84.00 ($0.93 per tablet)

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Imdur (Isosorbide mononitrate) is used to prevent chest pain (angina) in patients with a certain heart condition (coronary artery disease). 

Imdur belongs to a class of drugs known as nitrates. Imdur contains the medication isosorbide mononitrate, a type of nitrate medication. It works by relaxing and widening blood vessels so blood can flow more easily to the heart. 

This medication will not relieve chest pain once it occurs. Also, it is not intended to be taken just before physical activities (such as exercise or sexual intercourse) to prevent chest pain. 


  • Take Imdur by mouth as directed by your healthcare provider, usually once daily when you wake up.  
  • Swallow this medication whole with a half glass of water (4 ounces/120 milliliters).  
  • Always take Imdur exactly as prescribed by your healthcare provider, typically once daily in the morning.  
  • Take Imdur regularly at the same time each day for optimal benefits.  
  • Inform your healthcare provider if you experience increased or worsening chest pain, as Imdur's effectiveness might decrease over time, requiring dosage adjustments.  


  • Do not crush, chew, or split the tablets unless they have a score line, and your healthcare provider specifically instructs you to do so. This ensures that the medication is released slowly throughout the day.  
  • Do not stop taking Imdur without consulting your healthcare provider, as this can worsen your condition. Your healthcare provider will advise on proper tapering if needed. 

This is not an exhaustive list, and other side effects may occur. If you experience any unusual or severe side effects while taking  Imdur,  contact your healthcare provider for medical advice.

Before taking Imdur, tell your healthcare provider if you are allergic to it; or to similar drugs (such as isosorbide dinitrate, nitroglycerin); or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your healthcare provider for more details.

Before using this medication, tell your healthcare provider your medical history, especially of: low blood pressure.

Imdur may make you dizzy. Alcohol or marijuana (cannabis) can make you more dizzy. Do not drive, use machinery, or do anything that needs alertness until you can do it safely. Limit alcoholic beverages. Talk to your healthcare provider if you are using marijuana (cannabis).

Before having surgery, tell your healthcare provider about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).

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

During pregnancy, Imdur should be used only when clearly needed. Discuss the risks and benefits with your healthcare provider. It is unknown if this medication passes into breast milk. Consult your healthcare provider before breast-feeding.

Brand Name:


Generic name:

Isosorbide Mononitrate ER, Isosorbide Mononitrate PR, Isosorbide Mononitrate, Isosorbide Mononitrate ER

Other Names:

Imdur, Isosorbide Mononitrate Er, Isosorbide Mononitrate ER, Isosorbide Mononitrate, Imdur Durules

Strength(s): 30mg, 60mg, 120mg
Quantities Available: 30, 90

Extended Release Tablet, Extended ReleaseTablet, ER Tablet, Tablet

Important Information
The information above for Imdur (Isosorbide Mononitrate) was provided to by third parties. In no way should this information substitute for the advice of a physician. Consult a doctor or qualified health care professional if you have any medical concerns. widget logo
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