Lidocaini Hydrochloridum Noridem (Lidocaine Hydrochloride Monohydrate)

• Lidocaine Hydrochloride is used as a local anesthetic to block nerve conduction in various clinical settings.
• Minor surgical procedures: provides local anesthesia to enable painless incision and manipulation.
• Epidural analgesia: delivers regional pain relief during labor, surgery or postoperative care.
• Intradermal diagnostic testing: numbs the skin to allow safe administration of allergy or skin‑test agents.
• Intramuscular anesthesia: produces muscle relaxation for minor procedures requiring intramuscular injection.

• Lidocaine Hydrochloride exerts its effect by reversibly binding to the intracellular portion of voltage‑gated sodium channels on neuronal membranes. This blockade prevents the rapid influx of sodium ions during depolarisation, thereby inhibiting the generation and propagation of nerve impulses. The result is a temporary loss of sensation in the targeted area without affecting surrounding tissues, allowing controlled local anaesthesia for short‑duration procedures.

Adverse reactions to lidocaine hydrochloride are generally related to the site of administration or systemic absorption.

Common Side Effects

• Injection site pain: mild discomfort at the point of needle insertion.
• Redness or swelling: localized erythema or edema.
• Itching or rash: mild cutaneous irritation.
• Dizziness or light‑headedness: transient sensation of imbalance.
• Nausea or metallic taste: occasional gastrointestinal upset.
• Tremor: brief muscle tremors in sensitive individuals.

Serious or Rare Side Effects

• Systemic toxicity: seizures, central nervous system depression, or cardiac arrhythmias.
• Allergic reaction: urticaria, bronchospasm, or anaphylaxis.
• Methemoglobinemia: reduced oxygen‑carrying capacity of blood.
• Severe hypotension: sudden drop in blood pressure.

• When using lidocaine hydrochloride, clinicians should observe several safety precautions to minimise risk.
• Allergy assessment: verify no known hypersensitivity to amide‑type local anesthetics.
• Maximum dose calculation: determine the appropriate dose based on patient weight and procedure.
• Cardiovascular monitoring: observe heart rate and rhythm during epidural or high‑dose administration.
• Concurrent medications: review for drugs that may potentiate lidocaine toxicity, such as class I antiarrhythmics.
• Pregnancy and lactation: consider limited data and weigh benefits against potential risks.
• Store at controlled room temperature: keep in original container, protect from light and moisture.

Lidocaine hydrochloride may interact with other medicines, altering its plasma concentration or enhancing adverse effects.

Major Interactions (Avoid)

• Class I antiarrhythmics (e.g., quinidine, procainamide): increase lidocaine levels and risk of toxicity.
• CYP3A4 inhibitors (e.g., ketoconazole, erythromycin): reduce metabolism, raising systemic exposure.
• Beta‑blockers (e.g., propranolol) when given intravenously: may potentiate cardiac depression.

Moderate Interactions (Monitor Closely)

• Class II antiarrhythmics (e.g., amiodarone): may modestly increase lidocaine concentrations.
• Diuretics (e.g., furosemide): can decrease plasma protein binding, enhancing free drug.
• General anesthetics (e.g., halothane, sevoflurane): may augment central nervous system depression.