Lidocaine Chlorhydrate Renaudin (Anhydrous Lidocaine Hydrochloride)

• Lidocaine hydrochloride is employed in clinical practice to achieve rapid nerve block and to stabilize cardiac electrical activity.
• Local anesthesia: provides fast, reversible loss of sensation for minor surgical, dental and diagnostic procedures.
• Ventricular arrhythmias: suppresses abnormal ventricular rhythms by stabilizing myocardial cell membranes.
• Cardiac electrophysiology procedures: facilitates safe mapping and ablation by reducing excitability of cardiac tissue.
• Peripheral nerve blocks: enables regional anesthesia for limb surgeries.

• Lidocaine hydrochloride exerts its effect by binding to the intracellular portion of voltage‑gated sodium channels in excitable membranes. This blockade prevents the rapid influx of sodium ions during depolarization, thereby inhibiting the generation and propagation of nerve impulses. In cardiac tissue, the same sodium‑channel inhibition stabilizes myocardial cell membranes, reducing automaticity and suppressing ectopic ventricular activity. The effect is use‑dependent, becoming more pronounced at higher firing rates.

Lidocaine hydrochloride may be associated with a range of adverse reactions, varying from mild to severe.

Common Side Effects

• Dizziness: transient sensation of light‑headedness.
• Metallic taste: brief metallic sensation in the mouth.
• Nausea: mild gastrointestinal upset.
• Hypotension: temporary drop in blood pressure.

Serious or Rare Side Effects

• Severe allergic reaction: rash, itching, swelling, or anaphylaxis.
• Seizures: central nervous system excitation leading to convulsions.
• Cardiac arrest: profound depression of cardiac conduction and contractility.

When using lidocaine hydrochloride, clinicians should observe specific safety measures to minimize risk.

• Cardiac monitoring: observe ECG and blood pressure during intravenous administration.
• Dose adjustment: reduce dose in patients with hepatic impairment or advanced age.
• Hypersensitivity assessment: avoid use in individuals with known lidocaine allergy.
• Concomitant antiarrhythmics: use caution when combined with other class I antiarrhythmic agents.
• Fluid status: ensure adequate intravascular volume to prevent excessive hypotension.
• Store at room temperature: keep in original container, protect from moisture and light.

Lidocaine hydrochloride can interact with several medicines, altering its efficacy or safety profile.

Major Interactions (Avoid)

• Class I antiarrhythmics (e.g., quinidine, procainamide): additive cardiac conduction slowing.
• Beta‑blockers (e.g., propranolol): increased risk of bradycardia and hypotension.
• Calcium channel blockers (e.g., verapamil): potentiates negative inotropic effects.

Moderate Interactions (Monitor Closely)

• CYP3A4 inhibitors (e.g., ketoconazole, erythromycin): may raise lidocaine plasma levels.
• Diuretics (e.g., furosemide): can enhance lidocaine‑induced electrolyte disturbances.
• Other local anesthetics (e.g., bupivacaine): risk of cumulative neuro‑cardiac toxicity.