Nitroplast (Glyceryl Trinitrate)

Nitroplast, a nitrate vasodilator, is used in the treatment of coronary artery disease‑related chest pain.

• Prophylaxis of angina pectoris: reduces the frequency of anginal attacks during daily activities.
• Management of chronic stable angina: improves exercise tolerance and decreases myocardial oxygen demand.
• Ischemic heart disease: alleviates chest pain associated with reduced coronary blood flow.

• Glyceryl trinitrate is metabolized to nitric oxide, which activates guanylate cyclase in vascular smooth muscle. The resulting increase in cyclic GMP leads to relaxation of arterial and venous vessels, producing vasodilation, lowering preload and afterload, and consequently reducing myocardial oxygen consumption.

Nitroplast may cause a range of adverse reactions, most of which are related to its vasodilatory action.

Common Side Effects

• Headache: throbbing pain often occurring shortly after patch application.
• Flushing: warm sensation and redness of the skin.
• Dizziness or light‑headedness: due to transient blood pressure reduction.
• Skin irritation at the patch site: erythema or itching.

Serious or Rare Side Effects

• Severe hypotension: marked drop in blood pressure requiring medical attention.
• Syncope: fainting episodes caused by abrupt circulatory changes.
• Life‑threatening allergic reaction: rash, swelling, or breathing difficulty.
• Worsening angina or myocardial infarction: paradoxical increase in chest pain.
• Methemoglobinemia: rare disorder impairing oxygen delivery.

When prescribing Nitroplast, clinicians should consider several safety measures.

• Severe anemia: avoid use as it may exacerbate hypotension.
• Concomitant phosphodiesterase‑5 inhibitors: risk of profound blood pressure fall; avoid combination.
• Blood pressure monitoring: check regularly, especially after initiating therapy.
• Patch site rotation: change location with each application to minimize skin irritation.
• Store at room temperature: keep in original packaging, protect from moisture and light.

Nitroplast can interact with other medicines, altering its safety profile.

Major Interactions (Avoid)

• Sildenafil, tadalafil, or other PDE‑5 inhibitors: may cause severe hypotension.
• Other nitrates (e.g., isosorbide dinitrate): additive vasodilatory effect leading to dangerous blood pressure drops.
• Alcohol: potentiates hypotensive action.

Moderate Interactions (Monitor Closely)

• Antihypertensives such as ACE inhibitors or beta‑blockers: may enhance blood pressure lowering.
• Diuretics: increase risk of orthostatic hypotension.
• Certain anti‑arrhythmic agents: may require dose adjustments.