Does Medicare Cover Isosorbide Mononitrate ER?

Christian Worstell
In this article...
  • Isosorbide mononitrate ER can reduce your risk of experiencing an angina attack. Learn if you're eligible for isosorbide mononitrate ER coverage with Medicare.

Your doctor may prescribe isosorbide mononitrate ER if you have a history of angina attacks. Many people take this medication long-term, so the costs can add up even though it's an inexpensive medication. Fortunately, many Medicare enrollees are eligible for isosorbide mononitrate ER coverage.

What Is Isosorbide Mononitrate ER?

Isosorbide mononitrate ER is a nitrate medication used to prevent chest pain (angina) in people with coronary heart disease. It's ineffective at treating the symptoms of an established angina attack. Isosorbide mononitrate ER comes in tablet form and is available as a generic medication and under the brand name Imdur ER.

This extended-release medication works by reducing blood vessel constriction around the heart and improving blood flow. When taken regularly, it can lighten the heart's workload to minimize the risk of angina attacks. 

How much isosorbide mononitrate ER you need to take depends on several factors and varies from person to person. Your doctor determines the correct dosage; however, they most commonly prescribe a single dose of 30 or 60 milligrams daily for adults. 

Side Effects of Isosorbide Mononitrate ER

Isosorbide mononitrate ER can react with various other medications. It can cause dizziness or light-headedness, and hot weather, consuming alcohol and exercising can make these symptoms more likely to occur. Standing up quickly can also increase the risk of dizziness or fainting. Other side effects may include:

  • Bloody or tarry stools
  • Pain in the arm, back or jaw
  • Chest pain or tightness
  • Frequent urination
  • Headache
  • Muscle pain
  • Nausea or vomiting

Will My Medicare Policy Cover Isosorbide Mononitrate ER?

You'll almost certainly have isosorbide mononitrate ER coverage if your Medicare policy covers prescription drugs. All Medicare Part D policies cover generic isosorbide mononitrate ER, although they may not cover branded versions. Coverage is often unrestricted with no prior authorization requirements or quantity limits. 

Many Medicare Advantage enrollees are also eligible to receive coverage for this medication. However, it depends on whether your insurer offers prescription drug coverage as an added benefit. 

Original Medicare only covers medication if a health care provider administers it, such as injections in a clinical setting. It may also cover drugs falling under the bracket of durable medical equipment, such as insulin pumps. Therefore, Medicare Parts A and B (Original Medicare) don't cover isosorbide mononitrate ER because it's usually a self-administered drug.

How Much Will I Pay for Isosorbide Mononitrate ER With Medicare?

Isosorbide mononitrate ER is a relatively affordable drug, although prices fluctuate between vendors and locale. Generally, isosorbide mononitrate ER costs around $12 to $71 for 30 30-milligram tablets. You'll pay for your medication out of pocket if you have Original Medicare only. Medicare Part D and some Medicare Advantage enrollees pay for their own medication until they spend enough to satisfy the annual deductible. 

Many insurance companies selling policies with prescription drug coverage offer free isosorbide mononitrate ER coverage because it's inexpensive. However, others may charge co-pays up to $1.

Christian Worstell
About the Author

Christian Worstell is a senior Medicare and health insurance writer with He is also a licensed health insurance agent. Christian is well-known in the insurance industry for the thousands of educational articles he’s written, helping Americans better understand their health insurance and Medicare coverage.

Christian’s work as a Medicare expert has appeared in several top-tier and trade news outlets including Forbes, MarketWatch, WebMD and Yahoo! Finance.

While at HelpAdvisor, Christian has written hundreds of articles that teach Medicare beneficiaries the best practices for navigating Medicare. His articles are read by thousands of older Americans each month. By better understanding their health care coverage, readers may hopefully learn how to limit their out-of-pocket Medicare spending and access quality medical care.

Christian’s passion for his role stems from his desire to make a difference in the senior community. He strongly believes that the more beneficiaries know about their Medicare coverage, the better their overall health and wellness is as a result.

A current resident of Raleigh, Christian is a graduate of Shippensburg University with a bachelor’s degree in journalism. You can find Christian’s most recent articles in our blog.

If you’re a member of the media looking to connect with Christian, please don’t hesitate to email our public relations team at

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