Nitrolingual (Glyceryl Trinitrate)

• Nitrolingual, an organic nitrate used in cardiovascular care, is indicated for:
• Acute angina pectoris: rapid relief of chest pain during an angina episode.
• Prophylaxis of angina attacks: reduction in frequency of angina episodes in patients with known coronary artery disease.
• Stable angina: prevention of angina attacks during physical exertion or stress.

• Glyceryl trinitrate is metabolized to nitric oxide in vascular smooth‑muscle cells. The released nitric oxide activates soluble guanylate cyclase, increasing cyclic GMP levels, which cause relaxation of smooth muscle and vasodilation of veins and arteries. This reduces preload and afterload, lowering myocardial oxygen demand and alleviating ischemic chest pain. The effect is rapid, with onset within minutes after oromucosal administration, providing prompt symptom control.

Glyceryl trinitrate may cause a range of adverse reactions, which are categorized by frequency and severity.

Common Side Effects

• Headache: throbbing pain often triggered by vasodilation.
• Flushing: warmth and redness of the skin.
• Dizziness: light‑headed sensation, especially when standing quickly.
• Hypotension: mild drop in blood pressure causing faintness.

Serious or Rare Side Effects

• Severe hypotension: marked blood pressure fall leading to syncope.
• Syncope: sudden loss of consciousness.
• Allergic reaction: rash, itching, swelling, or anaphylaxis.
• Methemoglobinemia: rare disorder causing reduced oxygen delivery.

• When prescribing Nitrolingual, consider the following precautions to ensure safe use.
• Severe anemia or low blood pressure: avoid use as it may exacerbate hypotension.
• Concurrent phosphodiesterase‑5 inhibitors: contraindicated due to risk of profound hypotension.
• Recent myocardial infarction: use with caution and monitor cardiac status.
• Hypersensitivity to nitrates: discontinue immediately if allergic signs appear.
• Pregnancy and lactation: safety not established; weigh benefits against potential risks.
• Store at room temperature: keep in original container, protect from moisture and light.

Nitrolingual can interact with several medicines; awareness of major and moderate interactions helps prevent adverse events.

Major Interactions (Avoid)

• Sildenafil, tadalafil or other PDE5 inhibitors: may cause severe hypotension.
• Other organic nitrates or nitroglycerin preparations: additive blood‑pressure lowering effect.
• Strong antihypertensive agents (e.g., ACE inhibitors, beta‑blockers): may enhance hypotensive response.

Moderate Interactions (Monitor Closely)

• Diuretics: can increase risk of orthostatic hypotension.
• Alcohol: may potentiate vasodilatory effects and dizziness.