Nitrolingual Nitrospray (Glyceryl Trinitrate)

Nitrolingual Nitrospray (glyceryl trinitrate) acts on the coronary circulation to relieve myocardial ischemia. It is indicated for adult patients with documented coronary artery disease.

• Acute angina pectoris: provides rapid relief of chest pain by dilating coronary arteries and reducing cardiac preload and afterload, thereby lowering myocardial oxygen consumption.
• Prophylaxis of angina: used before physical activity or emotional stress to prevent angina attacks by maintaining coronary vasodilation.
• Stable coronary artery disease: employed as an adjunct to other anti‑anginal agents to improve exercise tolerance and reduce frequency of ischemic episodes.

• Glyceryl trinitrate is a nitric oxide donor that is enzymatically converted to nitric oxide in vascular smooth‑muscle cells. The released nitric oxide activates soluble guanylate cyclase, increasing cyclic GMP levels, which leads to relaxation of smooth muscle in veins and arteries. This vasodilation reduces both preload and afterload, decreasing myocardial oxygen demand and improving coronary blood flow, and thereby alleviating ischemic symptoms.

Glyceryl trinitrate 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 face or neck.
• Dizziness: light‑headed sensation, especially when standing quickly.
• Hypotension: transient drop in blood pressure causing faintness.
• Nausea: feeling of stomach upset that may accompany other symptoms.
• Palpitations: awareness of rapid or irregular heartbeats.

Serious or Rare Side Effects

• Severe hypotension: marked blood pressure fall leading to syncope.
• Reflex tachycardia: rapid heart rate in response to blood pressure drop.
• Methemoglobinemia: rare disorder causing reduced oxygen delivery to tissues.
• Cardiac arrest: extremely rare but life‑threatening event.
• Severe allergic reaction: rash, swelling, or breathing difficulty indicating possible anaphylaxis.

When using Nitrolingual Nitrospray, several precautions should be observed to ensure safety and effectiveness.

• Avoid use in patients with severe hypotension: risk of further blood pressure reduction.
• Do not combine with phosphodiesterase‑5 inhibitors: may cause profound hypotension.
• Use with caution in patients taking other nitrates: increased risk of additive vasodilation.
• Monitor blood pressure before and after administration: ensure values remain within safe limits.
• Educate patients on proper spray technique: hold spray upright, avoid inhalation, and allow spray to dissolve under the tongue.
• Store at room temperature: keep below 25°C in the original container, protect from moisture and direct sunlight.

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

Major Interactions (Avoid)

• Phosphodiesterase‑5 inhibitors (e.g., sildenafil, tadalafil): may cause severe hypotension.
• Other nitrates (isosorbide dinitrate, isosorbide mononitrate): additive vasodilatory effect leading to dangerous blood pressure fall.
• Guanylate cyclase stimulators (riociguat): increased risk of hypotension.
• Sodium nitroprusside: concurrent use may cause uncontrolled vasodilation.

Moderate Interactions (Monitor Closely)

• Antihypertensive agents (beta‑blockers, ACE inhibitors, calcium channel blockers): may enhance blood pressure‑lowering effect.
• Diuretics: potential for excessive volume depletion and hypotension.
• Alcohol: can potentiate vasodilatory response and dizziness.
• CYP3A4 inhibitors (e.g., ketoconazole, erythromycin): may increase plasma levels of glyceryl trinitrate.