Imdur is the brand name for a medication called Isosorbide Mononitrate. It belongs to a class of drugs known as nitrates. Medicine is primarily used for the prevention and treatment of angina pectoris, a condition characterized by chest pain or discomfort caused by reduced blood flow to the heart. It works by relaxing and widening the blood vessels, improving blood flow to the heart muscles, and reducing the workload on the heart.

Drug Name: Imdur

Active Ingredient: Isosorbide

Imdur tablets



Form: Tablet

Type: Generic

Prescription Required: Rx

Availability: In Stock

Imdur is usually taken orally, and the dosage and frequency of administration depend on the individual's condition and response to treatment.

How to use

Here are some general guidelines:

  1. Timing: Imdur is typically taken once daily in the morning.
  2. Administration: Swallow the tablet whole with a glass of water. Do not crush, chew, or break the tablet, as it is designed to release the medication slowly.
  3. Avoid abrupt discontinuation: If you have been using Imdur regularly, do not stop taking it suddenly. This could worsen your condition.
  4. Nitrate-free intervals: Some individuals may require a nitrate-free interval to prevent tolerance to the medication.
  5. Precautions: Certain medications, such as erectile dysfunction drugs like Viagra, can interact with Imdur and cause a dangerous drop in blood pressure.


The dosage of Imdur can vary depending on the individual's condition and response to treatment. Here are some general dosage guidelines:

  • For the prevention of angina: The usual starting dose is 30-60 milligrams (mg) once daily. Maximum dosage is 240 mg per day.
  • For the treatment of angina: The usual starting dose is 30-60 mg once daily. Maximum dosage is 240 mg per day.

Side effects

Imdur may cause certain side effects. Common side effects include:

  1. Headache: This is the most commonly reported side effect of Imdur. It is usually temporary and may improve with time.
  2. Dizziness or lightheadedness: You may experience a feeling of faintness or dizziness, especially when standing up quickly. It is recommended to get up slowly from a sitting or lying position.
  3. Flushing: Some individuals may experience redness or warmth in the face, neck, or chest.
  4. Low blood pressure: Medicine can cause a drop in blood pressure, leading to symptoms such as lightheadedness or fainting. This is more likely to occur if you are taking other medications that also lower blood pressure.
  5. Nausea or vomiting: Some people may experience gastrointestinal discomfort, including nausea or vomiting.
  6. Other side effects: Rarely, Imdur can cause allergic reactions, including rash, itching, or swelling.

It's important to note that not everyone will experience these side effects, and the severity can vary from person to person.


Imdur should be stored properly to maintain its effectiveness. Here are some storage guidelines:

  1. Temperature: Store drug at room temperature, ideally between 20°C and 25°C (68°F to 77°F).
  2. Moisture: Keep the medication in a dry place. Avoid exposing it to excessive moisture, such as in the bathroom.
  3. Light: Protect medicine from direct sunlight and strong artificial light. Store it in its original packaging or container to shield it from light exposure.
  4. Children and pets: Store Imdur in a secure location, out of reach of children and pets. The medication should be kept in a child-resistant container.
  5. Discard expired medication: Check the expiration date on the packaging and dispose of any expired Imdur properly. Do not use medication past its expiration date.

Always refer to the specific storage instructions provided by the manufacturer or consult your pharmacist if you have any concerns or questions regarding the proper storage of Imdur.


In the case of an overdose of Imdur, it is important to seek immediate medical attention or contact your local poison control center. Here are some general steps to follow:

  1. Call for help: Dial emergency services or your local poison control center immediately.
  2. Provide information: Give them details about the medication, the dosage taken, and the time of ingestion. If possible, have the medication packaging available for reference.
  3. Follow medical advice: Follow the instructions given by medical professionals.
  4. Watch for symptoms: Monitor for any signs of overdose, which may include severe headache, dizziness, rapid heartbeat, low blood pressure, difficulty breathing, or fainting.

It is crucial to act quickly and seek medical assistance in case of an overdose.

Missed Doses

If you miss a dose of Imdur, follow these general guidelines:

  1. Take it as soon as you remember: If you realize that you missed a dose and it is not close to the time of your next scheduled dose, take it as soon as possible.
  2. Skip the missed dose if it's close to the next dose: If it is almost time for your next dose, skip the missed dose and continue with your regular dosing schedule. Do not double the dose to make up for the missed one.
  3. Do not take extra doses: Avoid taking an extra dose to compensate for the missed one. Taking more than the prescribed amount can increase the risk of side effects.

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