Labetalol S.A.L.F. (Labetalol Hydrochloride)

• Labetalol is used in the management of acute elevations in blood pressure that require prompt control.
• Hypertensive emergencies: rapid reduction of dangerously high blood pressure to prevent organ damage.
• Severe hypertension: sustained lowering of elevated arterial pressure when oral therapy is insufficient.
• Preeclampsia: control of maternal hypertension to reduce risk to mother and fetus.

• Labetalol blocks alpha‑1 adrenergic receptors, causing vasodilation, while simultaneously antagonizing beta‑1 and beta‑2 receptors, which decreases heart rate and myocardial contractility. The combined effect reduces peripheral vascular resistance and cardiac output, leading to a prompt fall in arterial blood pressure.

Labetalol may cause a range of adverse reactions that vary in frequency and severity.

Common Side Effects

• Dizziness: sensation of light‑headedness, especially after dose initiation.
• Headache: mild to moderate pain often transient.
• Nausea: upset stomach, sometimes accompanied by vomiting.
• Flushing: warm, reddened skin, usually on the face or neck.

Serious or Rare Side Effects

• Severe hypotension: abrupt, marked drop in blood pressure requiring medical intervention.
• Bronchospasm: constriction of airways, particularly in patients with reactive airway disease.
• Hepatic dysfunction: elevated liver enzymes or jaundice.
• Cardiac conduction abnormalities: heart block or arrhythmias that may be life‑threatening.

• Before using Labetalol, clinicians should consider several safety measures.
• Monitor blood pressure: avoid excessive reductions that could cause syncope.
• Assess cardiac function: use cautiously in patients with bradycardia or heart block.
• Check liver function: dose adjustments may be needed in hepatic impairment.
• Avoid abrupt discontinuation: taper gradually if therapy has been long‑term.
• Pregnancy: prescribe only when the potential benefit justifies the potential risk to the fetus.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze or shake.

Labetalol can interact with other medicines, altering its efficacy or safety.

Major Interactions (Avoid)

• Other beta‑blockers: additive bradycardia and hypotension.
• Calcium channel blockers (e.g., verapamil): increased risk of severe hypotension.
• Epinephrine: reduced vasoconstrictive response, potentially compromising emergency treatment.

Moderate Interactions (Monitor Closely)

• NSAIDs: may blunt antihypertensive effect.
• Diuretics: can potentiate hypotensive response.
• CYP2D6 inhibitors (e.g., fluoxetine): may raise labetalol plasma concentrations.
• Anesthetic agents: enhanced cardiovascular depression during surgery.