Imdur (Isosorbide Mononitrate) prescription available online

If you are suffering from chest pain, Imdur can help. Get a new prescription or refill of Imdur today from a board-certified doctor online.*

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FDA-approved to treat angina pectoris

Available as an oral tablet or extended-release tablet

Helps the heart pump more easily

*Prescriptions are provided at the doctor’s discretion. Learn more about our controlled substances policy and how you can save up to 80% with our prescription discount card.

About Imdur

Imdur belongs to a class of medicines called nitrates, which function by dilating (widening) blood vessels to increase blood flow and help the heart pump more easily.

Imdur is used to treat angina pectoris (chest pain) associated with coronary artery disease. Imdur is available only by prescription. It is available in a generic formulation as well as under different brand names, including isosorbide mononitrate.

Imdur may be prescribed as an oral tablet or extended-release tablet. It's always important to follow the specific instructions on your prescription, as they can vary based on the formulation and dosage prescribed.

If you're prescribed Imdur, be sure to complete the full course of isosorbide mononitrate unless your doctor specifically tells you to stop. If you don’t complete your prescription, isosorbide mononitrate may not fully treat your chest pain.

Imdur uses

There is one FDA-approved use for Imdur, but it may also be used off-label to treat other conditions. Your online healthcare professional may prescribe it for the following reasons.

It’s also possible that your healthcare professional may prescribe it for other reasons not listed here. Ask your online doctor or pharmacist if you have questions about why a medication is prescribed.

  • Angina pectoris

    Imdur is FDA-approved to treat angina pectoris (chest pain) related to coronary artery disease. Imdur is not effective in stopping ongoing angina attacks. In addition, Imdur should not be taken before physical activity, such as exercise, to prevent angina attacks.

Imdur side effects

The side effects associated with taking Imdur are typically mild. Most Imdur side effects are associated with headaches. Imdur has some common side effects. They may include:

    • Lightheadedness

    • Headache

    • Flushing, warmth, or redness

    Other side effects, which are less common but might be more severe, could include:

    • Severe dizziness

    • Worsening angina pain

    • Irregular heartbeat

    • Increased intracranial pressure

    Tell your doctor if you notice adverse side effects, or if you develop any other new or concerning symptoms. Call your doctor immediately if you experience any symptoms of a heart attack.

    The use of Imdur is not recommended in children under 18 years old.

How to take Imdur

Your pharmacist will provide you with instructions on how to take your Imdur prescription. Be sure to read your prescription label and follow the instructions. Call your doctor or pharmacy if you have any questions.

Imdur can come in different forms and doses, so be sure to follow the specific instructions on your prescription. For chest pain, the starting dose for Imdur typically ranges from 30 mg to 60 mg taken once in the morning.

Do not crush, chew, or break extended-release tablets. Be careful when getting up from a sitting or lying position, as Imdur may cause very low blood pressure. Call your doctor if you feel sick or if you're sweating more than usual.

What to avoid while taking Imdur

Imdur has 194 drug interactions. Don’t change what you take without checking with your doctor or pharmacist. That includes other medications or supplements, as well as over-the-counter drugs. 

Possible drug interactions with Imdur include:

Be careful if you drink alcohol while taking Imdur. Drinking alcohol can increase the risk of adverse effects, such as low blood pressure (hypotension).

Medication alternatives to Imdur

If your healthcare provider prefers to put you on another treatment, they may suggest another nitrate or blood pressure medication in another drug class. Here are some common doctor-recommended alternatives based on your health issue:

Imdur prescription FAQs

  • How much does Imdur cost?

    Depending on your pharmacy, Imdur costs around $359 for one hundred 60 mg extended-release tablets without insurance. Fortunately, generic brands, such as isosorbide mononitrate, offer an affordable alternative.

  • How can I refill my Imdur prescription?

    To refill your Imdur prescription, book a virtual appointment with a board-certified PlushCare doctor. After reviewing your symptoms and medical history, your doctor can send an electronic prescription to your local pharmacy.

  • Who should not take Imdur?

    Avoid taking Imdur if you have certain medical conditions, such as:

    • Congestive heart failure

    • Kidney disease

    • Low blood pressure (severe hypotension)

    • Allergic reaction to isosorbide mononitrate

  • What should you avoid when taking isosorbide?

    Avoid drinking alcohol while taking isosorbide mononitrate. Isosorbide mononitrate can increase your risk of low blood pressure, and alcohol may have additive effects in lowering blood pressure.

    Be careful when getting up from a lying or sitting position, as it may make you dizzy.

    Do not stop taking Imdur suddenly, as this can increase your risk of a severe angina attack. Keep your medication on hand at all times.

  • What time of day should Imdur be taken?

    You should take Imdur first thing in the morning after waking up. You may also need a second dose later in the day. Follow your doctor's dosing instructions carefully.

  • What should you assess before taking Imdur?

    Your healthcare professional will assess your heart rate, ECG, and heart sounds, especially during exercise, to make sure Imdur is safe for you.

  • What happens if I miss a dose of Imdur?

    If you miss a dose of Imdur, take the missed dose as soon as you remember. Skip the missed dose if it's almost time for your next dose. Avoid taking two doses to make up for a missed dose.

  • What happens if I take too much Imdur?

    If you've taken too much Imdur, seek emergency medical attention, or contact your local poison control center or provincial poison control center (for Canada residents).

    An overdose of Imdur can be fatal. Overdose symptoms may include blurred vision, bloody diarrhea, severe dizziness, pounding heartbeat, and other serious symptoms.

3 simple steps to request your Imdur prescription today 

Step 1

Book an Imdur prescription request appointment.

Book a same day appointment from anywhere.

Step 2

Talk to your medical provider regarding your Imdur prescription.

Visit with a doctor on your smartphone or computer.

Step 3

Pick up your Imdur prescription.

We can send prescriptions to any local pharmacy.

How to talk to your doctor about Imdur (Isosorbide Mononitrate): helpful questions to ask

Chest pain can be a scary symptom. At PlushCare, we prioritize your heart health and well-being. If you're experiencing chest pain or have been diagnosed with angina, it's important to get all your questions answered about possible treatment. Here are some questions that may be helpful to discuss with your doctor during your telemedicine visit

  • Is the regular or extended release version right for me?

  • How long will it take for Imdur to take effect?

  • Will it negatively interact with the other medications I’m taking?

  • If I experience additional symptoms of my angina, are there other treatments I can try to help reduce my symptoms?

  • Are there any diet or lifestyle changes that I should make? 

  • If I experience unwanted side effects, would I be able to change the dosage of the medication, or are there other treatments I can try?

  • What early warning signs of a heart attack should I be on the lookout for?

  • How can I track my treatment progress, and when should I schedule a follow-up appointment?

Imdur prescription pricing details

How pricing works

To get a new or refill on your Imdur prescription, join our monthly membership and get discounted visits.

Paying with insurance



First month free



30 days of free membership

  • Same-day appointments 7 days a week

  • Unlimited messages with your Care Team

  • Prescription discount card to save up to 80%

  • Exclusive discounts on lab tests

  • Free memberships for your family

  • Cancel anytime

Visit price with insurance

Often the same as an office visit. Most patients with in-network insurance pay $30 or less!

  • We accept these insurance plans and many more:

    • Humana
    • Aetna
    • Cigna

Paying without insurance



First month free



30 days of free membership

  • Same-day appointments 7 days a week

  • Unlimited messages with your Care Team

  • Prescription discount card to save up to 80%

  • Exclusive discounts on lab tests

  • Free memberships for your family

  • Cancel anytime

Visit price without insurance

Initial visits are $129.

Book an appointment

If we're unable to treat you, we'll provide a full refund.


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PlushCare content is reviewed by MDs, PhDs, NPs, nutritionists, and other healthcare professionals. Learn more about our editorial standards and meet the medical team. The PlushCare site or any linked materials are not intended and should not be construed as medical advice, nor is the information a substitute for professional medical expertise or treatment.