Glyceryl Trinitrate Macure (Glyceryl Trinitrate)

Glyceryl Trinitrate Macure is indicated for several acute cardiovascular situations where rapid vasodilation is required. It is commonly employed in clinical practice for the following purposes:

• Relief of acute angina pectoris episodes
• Management of acute heart failure with pulmonary congestion
• Treatment of hypertensive emergencies
• Stabilisation of patients undergoing myocardial infarction
• Adjunct therapy during cardiac surgery to reduce myocardial oxygen demand

Side effects of Glyceryl Trinitrate Macure vary in frequency and severity. Patients should be aware of both common and serious reactions.

Common

• Headache, often described as throbbing
• Flushing or warmth of the face and neck
• Hypotension leading to dizziness
• Reflex tachycardia
• Nausea or vomiting

Serious

• Severe hypotension causing syncope
• Acute myocardial ischemia due to coronary steal
• Methemoglobinemia (rare)
• Allergic reactions such as rash or bronchospasm

Before initiating Glyceryl Trinitrate Macure, clinicians should consider several safety measures to minimise risk. Important precautions include:

• Assess baseline blood pressure; avoid use in patients with already low systolic pressure.
• Monitor heart rate continuously for reflex tachycardia.
• Use with caution in patients with severe aortic stenosis or hypertrophic cardiomyopathy.
• Evaluate for recent use of phosphodiesterase inhibitors, which may potentiate hypotension.
• Adjust dosage in patients with hepatic impairment, as metabolism may be altered.
• Ensure proper intravenous line placement to prevent extravasation and local tissue injury.

Glyceryl Trinitrate Macure can interact with several drug classes, influencing its safety and efficacy. Interaction guidance is divided into two categories.

Avoid

• Concurrent use with phosphodiesterase‑5 inhibitors (e.g., sildenafil, tadalafil) due to risk of profound hypotension.
• Combined therapy with other potent vasodilators such as hydralazine or nitroprusside.
• Use with selective serotonin reuptake inhibitors that may increase risk of serotonin syndrome.

Use with caution

• Beta‑blockers, which may blunt reflex tachycardia.
• Diuretics, which can exacerbate volume depletion and hypotension.
• Calcium channel blockers, particularly dihydropyridines, for additive blood pressure effects.
• Antihypertensive agents such as ACE inhibitors or ARBs, requiring close monitoring of blood pressure.