Product image of Nitroglycerin (Glyceryl Trinitrate) supplied by GNH India

Nitroglycerin

Active Ingredient:
Glyceryl Trinitrate
Origin:
EU

Nitroglycerin (Glyceryl Trinitrate)

Glyceryl trinitrate, the active ingredient in Nitroglycerin, is a nitrate vasodilator presented as a sublingual tablet for sublingual use. It is employed to relieve acute angina attacks, prevent angina episodes, and as adjunct therapy in certain cases of heart failure, acting by reducing myocardial oxygen demand.

GNH India supplies Nitroglycerin as a licensed, GDP‑compliant international pharmaceutical supplier serving hospitals, pharmacies and clinics worldwide. The company adheres to stringent quality standards and provides regulatory‑approved batches to meet global demand. Delivery is coordinated with local import requirements to ensure timely availability.

Manufacturer / TM Owner

Orifarm Healthcare A/S

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Indications & Clinical Uses

  • Nitroglycerin, a nitrate vasodilator, is used in the management of several cardiovascular conditions.
  • Acute angina pectoris: rapid relief of chest pain by dilating coronary vessels.
  • Prophylaxis of angina pectoris: prevention of angina episodes through reduced cardiac workload.
  • Heart failure (adjunct therapy): improves symptoms when added to standard heart‑failure treatment.

How It Works

  • Glyceryl trinitrate is metabolized to nitric oxide within vascular smooth muscle. The nitric oxide activates guanylate cyclase, increasing cyclic GMP levels, which leads to relaxation of smooth muscle in veins and arteries. Venous dilation reduces preload, while arterial dilation lowers afterload, together decreasing myocardial oxygen consumption and alleviating ischemic chest pain. The effect is rapid, typically within minutes, making sublingual administration effective for acute symptom control.

Side Effects

Nitroglycerin may cause a range of adverse reactions, varying from mild to severe.

Common Side Effects

  • Headache: throbbing pain often triggered by vasodilation.
  • Flushing: warmth and redness of the skin.
  • Dizziness or light‑headedness: due to reduced blood pressure.
  • Hypotension: transient drop in blood pressure.
  • Nausea: mild gastrointestinal upset.

Serious or Rare Side Effects

  • Severe hypotension: marked blood pressure fall leading to syncope.
  • Methemoglobinemia: rare disorder affecting oxygen transport.
  • Reflex tachycardia: rapid heart rate in response to blood pressure drop.
  • Allergic reactions: rash, itching, or anaphylaxis.

Precautions & Warnings

  • When prescribing nitroglycerin, clinicians should observe several safety considerations.
  • Contraindication: avoid in patients with known hypersensitivity to nitrates.
  • Caution: use carefully in patients with severe anemia or increased intracranial pressure.
  • Interaction warning: do not combine with phosphodiesterase‑5 inhibitors due to risk of profound hypotension.
  • Monitoring: assess blood pressure and heart rate before and after dosing.
  • Pregnancy: safety not established; prescribe only if benefit outweighs potential risk.
  • Store at below 25°C: keep tablets in original container, protect from moisture and light.

Avoid Interactions

Nitroglycerin can interact with several medicines, altering its efficacy or safety profile.

Major Interactions (Avoid)

  • Phosphodiesterase‑5 inhibitors (e.g., sildenafil): may cause severe hypotension.
  • Other nitrates or nitric‑oxide donors: additive vasodilatory effect leading to dangerous blood pressure fall.

Moderate Interactions (Monitor Closely)

  • Antihypertensives (beta‑blockers, ACE inhibitors): may enhance blood‑pressure‑lowering effect.
  • Diuretics: can increase risk of orthostatic hypotension.
  • Alcohol: may potentiate vasodilatory response and dizziness.

Frequently Asked Questions

Nitroglycerin is prescribed to relieve acute episodes of angina pectoris, to prevent angina attacks in patients with chronic coronary disease, and as an adjunctive therapy in selected cases of heart failure where reduction of cardiac workload is desired.

Glyceryl trinitrate is converted inside vascular smooth muscle to nitric oxide. The nitric oxide stimulates guanylate cyclase, raising cyclic GMP levels, which relaxes smooth muscle in veins and arteries. This reduces preload and afterload, lowering myocardial oxygen demand and easing chest pain.

The appropriate dose of nitroglycerin is determined by the prescribing clinician based on the individual patient's condition, severity of symptoms, and response to therapy. Dosage regimens are not standardized and should follow the prescriber’s instructions.

Safety data for nitroglycerin during pregnancy and lactation are limited. It is classified as pregnancy category unknown, and use is generally reserved for situations where the potential benefit justifies any possible risk to the fetus or infant. Consultation with a healthcare professional is essential.

To place an order, submit an enquiry on the product page at gnhindia.com specifying the required quantity. GNH India supplies hospitals, pharmacies and procurement teams worldwide, and will request verification of trade or institutional credentials before providing pricing, availability, shipping details and any necessary import documentation.

Nitroglycerin provides rapid relief through direct vasodilation, whereas other anti‑anginals such as beta‑blockers or calcium‑channel blockers work by reducing heart rate or contractility. Nitroglycerin is especially useful for immediate symptom control, while other classes are often used for long‑term management.

Nitroglycerin sublingual tablets should be stored below 25 °C in their original container, protected from moisture and light. Keep the product out of reach of children and avoid exposure to high temperatures, which can degrade potency.

Nitroglycerin is administered sublingually, typically by placing a tablet under the tongue and allowing it to dissolve completely without swallowing. This route provides rapid absorption into the bloodstream for quick onset of action.

The most serious risks include severe hypotension, which can cause fainting or shock, and rare occurrences of methemoglobinemia that impair oxygen delivery. Patients should be monitored for sudden drops in blood pressure and any signs of allergic reaction.

Nitroglycerin should be avoided in individuals with known hypersensitivity to nitrates, those who have taken phosphodiesterase‑5 inhibitors within the past 24 hours, and patients with severe anemia, increased intracranial pressure, or uncontrolled hypotension.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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