Nitroglicerina Zentiva (Glyceryl Trinitrate)

Nitroglicerina Zentiva, an organic nitrate used in cardiovascular therapy, is indicated for:

• Angina pectoris: provides rapid relief of chest pain by reducing myocardial oxygen demand.
• Acute coronary syndromes: helps prevent ischemic events through sustained vasodilation.
• Heart failure: improves symptoms by decreasing preload and afterload.

• Glyceryl trinitrate donates nitric oxide, which activates soluble guanylate cyclase in vascular smooth‑muscle cells. The resulting increase in cyclic GMP leads to relaxation of veins and arteries, producing venodilation and arterial dilation that lower cardiac preload and afterload, thereby reducing myocardial oxygen consumption.

Nitroglicerina Zentiva may cause a range of adverse reactions.

Common Side Effects

• Headache: throbbing pain often occurring shortly after application.
• Dizziness or light‑headedness: due to lowered blood pressure.
• Flushing: warm sensation and reddening of the skin.
• Skin irritation at the patch site: erythema or itching.
• Tachycardia: compensatory increase in heart rate.
• Hypotension: mild drop in blood pressure.

Serious or Rare Side Effects

• Severe hypotension: marked blood pressure fall requiring medical intervention.
• Syncope: sudden loss of consciousness.
• Myocardial infarction: rare worsening of cardiac ischemia.
• Severe allergic reaction: rash, swelling, or breathing difficulty.
• Methemoglobinemia: abnormal hemoglobin affecting oxygen transport.
• Skin necrosis: rare severe tissue damage at the application site.

Before using Nitroglicerina Zentiva, consider the following precautions:

• Cardiovascular assessment: evaluate blood pressure and cardiac status.
• Avoid in severe anemia: reduced oxygen‑carrying capacity may worsen symptoms.
• Use with caution in hypotension: monitor for excessive blood‑pressure decline.
• Monitor for tolerance development: effectiveness may diminish over time.
• Contraindicated with phosphodiesterase‑5 inhibitors: risk of profound hypotension.
• Store at room temperature below 25°C: keep in the original pack, protect from moisture and direct sunlight.

Nitroglicerina Zentiva can interact with several medicines.

Major Interactions (Avoid)

• Phosphodiesterase‑5 inhibitors (e.g., sildenafil): may cause severe hypotension.
• Other nitrates (e.g., isosorbide dinitrate): additive vasodilatory effect.
• Potent antihypertensives (e.g., clonidine): risk of excessive blood‑pressure drop.

Moderate Interactions (Monitor Closely)

• Alcohol: can enhance vasodilatory response.
• Beta‑blockers: may mask tachycardia signs.
• Diuretics: may increase the likelihood of hypotension.