Noradrenalin Kalceks (Norepinephrine)

Norepinephrine acts as a potent vasopressor targeting the sympathetic nervous system to counteract severe hypotension.

• Hypotension: restores adequate arterial pressure and organ perfusion in patients with acute low blood pressure.
• Septic shock: supports circulatory function and improves hemodynamics during systemic infection‑induced vasodilation.
• Cardiac arrest: provides immediate vasoconstrictive support during resuscitation efforts to maintain coronary and cerebral perfusion.

• Norepinephrine binds directly to α1‑ and α2‑adrenergic receptors on vascular smooth muscle, causing potent vasoconstriction, while its modest β1‑adrenergic activity increases myocardial contractility and heart rate. These effects are dose‑dependent and are rapidly reversible upon discontinuation, allowing precise titration in the intensive care environment.

Norepinephrine administration may be associated with a range of adverse reactions, varying from mild to life‑threatening.

Common Side Effects

• Hypertension: an excessive increase in arterial pressure that may require infusion rate adjustment.
• Tachycardia: a rapid heart rate that can be uncomfortable and may need monitoring.
• Headache: a pressure‑type headache often related to sudden changes in blood pressure.

Serious or Rare Side Effects

• Myocardial ischemia: reduced oxygen delivery to cardiac tissue, potentially leading to chest pain or infarction.
• Tissue necrosis at infusion site: severe extravasation causing skin discoloration, ulceration, and possible loss of tissue.
• Severe arrhythmia: life‑threatening irregular heart rhythms such as ventricular tachycardia or fibrillation.

When using norepinephrine, careful clinical monitoring and specific precautions are essential to ensure safety and therapeutic effectiveness.

• Blood pressure monitoring: continuously assess arterial pressure to titrate infusion.
• Cardiac function assessment: evaluate heart rate and rhythm for arrhythmias.
• Dose titration: adjust infusion rate gradually to avoid abrupt hemodynamic shifts.
• Extravasation risk: avoid peripheral administration; use central venous access when possible.
• Vascular disease caution: use with heightened vigilance in patients with peripheral arterial disease.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze or shake.

Norepinephrine can interact with several medications, altering its hemodynamic effects or increasing adverse risk.

Major Interactions (Avoid)

• MAO inhibitors: may cause hypertensive crisis when combined.
• Tricyclic antidepressants: synergistic increase in blood pressure.
• β‑blockers: can blunt β‑mediated cardiac effects, leading to unopposed α‑vasoconstriction.

Moderate Interactions (Monitor Closely)

• Vasodilators (e.g., nitroglycerin): may reduce norepinephrine efficacy, requiring higher doses.
• ACE inhibitors: additive hypotensive effect after discontinuation of norepinephrine.
• Calcium channel blockers: can affect vascular tone and require careful blood pressure monitoring.