Imdur Tablet PR (Isosorbide Mononitrate)
Imdur Tablet PR contains Isosorbide Mononitrate, a prolonged-release nitrate medicine used to prevent angina (chest pain) associated with heart disease. It works by relaxing and widening blood vessels, improving blood flow and reducing the workload on the heart.
Product Overview
Imdur Tablet PR is a prolonged-release cardiovascular formulation containing Isosorbide Mononitrate, a nitrate-class anti-anginal medicine widely used for the prevention and maintenance treatment of angina pectoris associated with coronary artery disease and reduced blood supply to the heart.
The prolonged-release formulation is specially designed to release the medicine gradually over an extended period, helping maintain stable therapeutic concentrations in the bloodstream throughout the day. This sustained delivery system supports long-lasting symptom control and reduces fluctuations commonly associated with short-acting nitrate formulations.
Isosorbide Mononitrate works primarily by relaxing vascular smooth muscles and widening blood vessels, especially veins and coronary arteries. This vasodilatory effect decreases venous return to the heart, lowers cardiac workload, and reduces the amount of oxygen the heart muscle requires to function effectively. At the same time, improved coronary blood flow enhances oxygen delivery to cardiac tissues, helping reduce the frequency and severity of angina attacks.
Product Composition and Form
Imdur Tablet PR is formulated as a prolonged-release oral nitrate preparation designed to provide controlled drug delivery and sustained cardiovascular support over an extended dosing period.
| Feature | Specification |
| Active Ingredient | Isosorbide Mononitrate |
| Drug Class | Nitrate / Anti-anginal Agent |
| Dosage Form | Prolonged-Release (PR) Tablet |
| Primary Indication | Prevention and long-term management of angina pectoris |
| Mechanism Type | Vasodilation and vascular smooth muscle relaxation |
| Release System | Controlled / Sustained-release formulation |
| Route of Administration | Oral |
Therapeutic Approach
Imdur Tablet PR works through gradual and sustained release of Isosorbide Mononitrate into the bloodstream, allowing prolonged relaxation of blood vessels and stable cardiovascular support throughout the dosing interval.
The medicine primarily acts by dilating veins and coronary arteries, which reduces venous return to the heart and decreases cardiac workload. By lowering the pressure and oxygen demand placed on the heart muscle, it helps prevent episodes of chest pain associated with insufficient oxygen supply.
In addition to reducing oxygen demand, the medicine also improves blood flow through coronary vessels, enhancing oxygen delivery to cardiac tissues. This dual cardiovascular effect contributes to better exercise tolerance, symptom control, and long-term angina management.
Precautions
General Precautions
Imdur Tablet PR should be used carefully under medical supervision, particularly in patients with low blood pressure, dehydration, heart disorders, or those receiving other cardiovascular medications. Proper adherence to dosage instructions is important to maintain stable cardiovascular response and reduce the risk of complications during long-term therapy.
✔ Maintain adequate hydration, especially during hot weather, illness, or excessive sweating, as dehydration may increase hypotension risk
✔ Avoid alcohol consumption during therapy because it may intensify dizziness, flushing, and blood pressure lowering effects
✔ Use cautiously in elderly patients, as they may be more sensitive to the medicine’s vasodilatory effects and blood pressure changes
✔ Patients with severe anemia, low blood volume, or certain heart valve disorders should use the medicine carefully under close medical supervision
✔ Rise slowly from sitting or lying positions to reduce the risk of dizziness, fainting, or sudden blood pressure drops
Usage
General Usage Information
Imdur Tablet PR is prescribed for the prevention and long-term management of angina attacks in patients with coronary artery disease or chronic ischemic heart conditions. It is intended for regular maintenance therapy and not for immediate relief of sudden chest pain episodes.
Key Usage Points
✔ Take the medicine exactly as prescribed by your healthcare professional to maintain stable cardiovascular support
✔ Swallow the prolonged-release tablet whole without crushing, chewing, or breaking, as altering the tablet may interfere with the controlled-release mechanism
✔ Usually administered once daily to provide sustained anti-anginal action throughout the day
✔ Do not stop treatment suddenly without medical advice, as abrupt discontinuation may worsen angina symptoms or trigger rebound chest pain
Uses
Imdur Tablet PR is widely used in cardiovascular management protocols where prolonged nitrate therapy is required to improve coronary circulation, reduce cardiac workload, and prevent recurrent angina episodes.
Its long-acting vasodilatory properties help support long-term cardiovascular stability and symptom management in patients with chronic ischemic heart conditions.
Key Points
✔ Long-acting nitrate formulation designed for sustained angina prevention and cardiovascular support
✔ Helps improve blood flow to the heart muscle by widening coronary blood vessels
✔ Reduces cardiac workload and myocardial oxygen demand, helping prevent chest pain episodes
✔ Prolonged-release system provides extended therapeutic action and stable symptom control throughout the dosing interval
Side Effects
General Safety Information
Imdur Tablet PR is generally well tolerated when used as prescribed for long-term cardiovascular management. Since the medicine works by widening blood vessels, some side effects are related to changes in blood pressure and vascular relaxation, particularly during the initial phase of treatment or after dose adjustments
Common Side Effects
✔ Headache due to blood vessel dilation, especially at the beginning of therapy
✔ Dizziness or lightheadedness caused by lowering of blood pressure
✔ Flushing or warmth sensation in the face and upper body
✔ Mild nausea or stomach discomfort
Serious Side Effects (Rare)
âš Seek immediate medical attention if you experience:
- Severe dizziness or fainting
- Worsening chest pain or severe hypotension
- Difficulty breathing
Why These Side Effects May Occur
Most side effects occur because Isosorbide Mononitrate relaxes and widens blood vessels to reduce cardiac workload and improve blood flow. Excessive vasodilation may temporarily lower blood pressure and trigger symptoms such as headache, dizziness, or flushing.
FAQs
Q. What is Imdur Tablet PR used for?
Imdur Tablet PR is used for the prevention and long-term management of angina pectoris (heart-related chest pain) caused by reduced blood flow to the heart.
Q. How does Isosorbide Mononitrate work?
It works by relaxing and widening blood vessels, especially coronary arteries and veins, which improves blood flow and reduces the workload and oxygen demand on the heart.
Q. Can Imdur Tablet PR relieve sudden chest pain attacks?
No. Imdur Tablet PR is designed for prevention and maintenance therapy and should not be used for immediate relief of acute angina attacks.
Q. Why should the tablet not be crushed or chewed?
The tablet is a prolonged-release formulation designed to release the medicine slowly over time. Crushing or chewing may interfere with the controlled-release mechanism and affect treatment effectiveness.
Q. Can alcohol be consumed while taking Imdur Tablet PR?
Alcohol should be avoided or used cautiously, as it may enhance blood vessel relaxation and increase the risk of dizziness, fainting, or low blood pressure.
Q. Can Imdur Tablet PR affect blood pressure?
Yes. Since it widens blood vessels, it may lower blood pressure and occasionally cause dizziness or fainting, particularly when standing up suddenly.
Q. Is Imdur Tablet PR safe for long-term use?
Yes, it is commonly prescribed for long-term cardiovascular management under medical supervision, provided dosage instructions and regular monitoring are followed.
Interactions
Imdur Tablet PR may interact with medicines or substances that affect blood pressure, heart function, or vascular tone. These interactions can increase the risk of excessive blood pressure reduction, dizziness, fainting, or cardiovascular complications. Careful medical supervision is important when combining nitrate therapy with other cardiovascular medications.
Interaction with Erectile Dysfunction Medicines
Combining Isosorbide Mononitrate with medicines used for erectile dysfunction may cause a dangerous and sudden drop in blood pressure due to excessive blood vessel relaxation.
Possible effects include:
- Severe dizziness
- Fainting
- Rapid heartbeat
- Sudden hypotension
- Cardiovascular collapse in severe cases
This combination is generally contraindicated unless specifically advised by a healthcare professional.
Interaction with Blood Pressure Medicines
Other antihypertensive medicines may enhance the blood pressure lowering effect of Imdur Tablet PR.
This may increase the risk of:
- Dizziness
- Weakness
- Lightheadedness
- Orthostatic hypotension
- Fainting episodes
Blood pressure monitoring may be required during combined therapy.
| Manufacturer | : | AstraZeneca, India |
| Equivalent Brand | : | Isosorb Mono |
| Generic Search | : | Isosorbide Mononitrate |
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