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Nitroglycerin: Brands, Price & Uses in Bangladesh
Nitroglycerin is an organic nitrate vasodilator used mainly for the management of angina pectoris (chest pain) caused by coronary artery disease.
About Nitroglycerin
Indications of Nitroglycerin
Nitroglycerin is an organic nitrate vasodilator used mainly for the management of angina pectoris (chest pain) caused by coronary artery disease.
Established/FDA-approved uses
- Acute relief of angina attacks (sublingual tablet, sublingual/translingual spray): taken at the onset of an anginal attack.
- Prophylaxis (prevention) of angina before activities known to provoke an attack (sublingual tablet/spray taken 5-10 minutes beforehand; extended-release oral tablets/capsules and transdermal patches for longer-term prevention).
- Intravenous Nitroglycerin is FDA-approved for control of blood pressure in perioperative hypertension, for treatment of congestive heart failure associated with acute myocardial infarction, for treatment of angina pectoris that has not responded to sublingual Nitroglycerin and beta-blockers, and for producing controlled hypotension during surgical procedures.
Guideline-supported / adjunct uses
- Adjunct therapy in acute coronary syndrome and acute decompensated heart failure with pulmonary congestion, in combination with other standard therapies, under close medical supervision.
Nitroglycerin does not replace the need for evaluation and long-term management of underlying coronary artery disease.
Dosage & Administration of Nitroglycerin
Acute relief of angina (sublingual tablet)
One tablet (commonly 0.3-0.6 mg) placed under the tongue or in the buccal pouch at the onset of an anginal attack, allowed to dissolve completely; do not swallow. May repeat one tablet every 5 minutes if pain persists, up to a maximum of 3 tablets within 15 minutes. If chest pain is not relieved after the first dose, seek emergency medical attention promptly.
Prophylaxis before activity (sublingual tablet/spray)
One dose taken 5-10 minutes before an activity likely to provoke angina.
Sublingual/translingual spray
1-2 metered sprays onto or under the tongue at the onset of an attack; may repeat every 5 minutes as needed, to a maximum of 3 sprays within 15 minutes. Do not shake the canister before use unless directed; do not inhale the spray.
Extended-release oral tablets/capsules (prevention)
Typically started at a low dose (e.g. 2.5-2.6 mg) once or twice daily and titrated by a physician, with a nitrate-free interval of 10-12 hours daily to reduce tolerance. Swallow whole; do not crush or chew.
Transdermal patch (prevention)
Applied once daily to a clean, hairless area of skin, worn for 12-14 hours, then removed to allow a nitrate-free interval (typically overnight) to reduce tolerance. Dose is individualized by a physician.
Topical ointment
Applied in a measured strip to the skin as directed by a physician, typically with a similar nitrate-free interval strategy.
Intravenous infusion (hospital setting only)
Administered as a continuous IV infusion via a non-PVC administration set, with the dose individually titrated to clinical response (e.g. blood pressure, chest pain relief) under continuous monitoring by trained medical personnel.
Administration technique
For the first dose of sublingual/spray Nitroglycerin, patients should be seated to reduce the risk of dizziness or fainting from a sudden drop in blood pressure.
Side Effects of Nitroglycerin
The most common side effect of Nitroglycerin is headache, which occurs frequently, especially at the start of treatment, and often diminishes with continued use; it reflects the drug's vasodilating action and is usually managed with mild analgesics rather than stopping treatment (consult a physician if severe or persistent).
Common side effects
- Headache (very common, often dose-related)
- Flushing of the face and neck
- Dizziness or lightheadedness, especially on standing (orthostatic hypotension)
- Hypotension
- Tachycardia (reflex increase in heart rate)
- Nausea, vomiting
Less common/serious side effects
- Syncope (fainting)
- Paradoxical bradycardia and increased angina at higher doses
- Skin reactions at application site (patch/ointment) - local irritation, contact dermatitis
- Rarely, methemoglobinemia with prolonged high-dose use
Patients should seek prompt medical attention for severe dizziness, fainting, or chest pain that does not resolve with Nitroglycerin.
Contraindications of Nitroglycerin
Nitroglycerin is absolutely contraindicated in patients with:
- Known hypersensitivity to Nitroglycerin or other nitrates/nitrites.
- Concurrent use of PDE5 inhibitors (sildenafil, tadalafil, vardenafil) - risk of severe, life-threatening hypotension.
- Concurrent use of the soluble guanylate cyclase stimulator riociguat - risk of severe hypotension.
- Severe hypotension or uncorrected hypovolemia.
- Right ventricular infarction (nitrates can precipitously drop preload and worsen this condition).
- Severe anemia.
- Increased intracranial pressure (e.g. from head trauma or cerebral hemorrhage).
- Acute circulatory failure or cardiogenic shock, unless adequate filling pressures are maintained with hemodynamic support.
Frequently Asked Questions about Nitroglycerin
What is Nitroglycerin used for?
Nitroglycerin is used to relieve and prevent angina (chest pain) caused by reduced blood flow to the heart in coronary artery disease. It works by relaxing and widening blood vessels, reducing the heart's workload and improving blood flow.
How quickly does Nitroglycerin work for chest pain?
Sublingual (under-the-tongue) tablets and spray forms of Nitroglycerin typically start working within 1-3 minutes. If chest pain does not improve after the first dose, a second dose may be taken after 5 minutes (up to 3 doses in 15 minutes), and emergency medical help should be sought if pain persists.
Why must I avoid taking Nitroglycerin with sildenafil, tadalafil, or vardenafil?
Combining Nitroglycerin with PDE5 inhibitors such as sildenafil, tadalafil, or vardenafil (commonly used for erectile dysfunction or pulmonary hypertension) can cause a severe, life-threatening drop in blood pressure. This combination is absolutely contraindicated; tell your doctor about any use of these medicines before starting Nitroglycerin.
Why do I get headaches with Nitroglycerin?
Headache is a very common and expected side effect of Nitroglycerin because it widens blood vessels, including those in the head. It often lessens with continued use; mild pain relievers can help, but you should consult your physician if headaches are severe or persistent.
Is Nitroglycerin safe to use during pregnancy?
Nitroglycerin should be used in pregnancy only if clearly needed and if the potential benefit justifies the potential risk to the fetus. Limited data are available, so always consult your physician before using Nitroglycerin if you are pregnant or planning pregnancy.
Why does my doctor tell me to have a "nitrate-free" period each day?
With continuous, around-the-clock use of long-acting Nitroglycerin (patches or extended-release tablets), the body can develop tolerance, making the medicine less effective. A daily nitrate-free interval of about 10-14 hours (often overnight) helps maintain Nitroglycerin's effectiveness; follow your physician's specific instructions.
Disclaimer
The information provided is accurate to the best of our knowledge, but it does not replace professional medical advice. We cannot guarantee its completeness or accuracy, and the absence of specific information about a drug should not be taken as an endorsement. We are not responsible for any consequences arising from this information, so please consult a healthcare professional for any concerns or questions.