Lidocainhydrochlorid Noridem (Lidocaine Hydrochloride Monohydrate)

• Lidocaine Hydrochloride is used as a local anesthetic to block nerve conduction during various procedural contexts.
• Surgical procedures: provides rapid onset of reversible loss of sensation, facilitating operative interventions without patient discomfort.
• Infiltration analgesia: enables targeted pain control for minor surgeries or diagnostic procedures.
• Epidural anesthesia: supports labor analgesia and postoperative pain management through segmental nerve blockade.

• Lidocaine Hydrochloride exerts its effect by binding to voltage‑gated sodium channels on neuronal membranes, stabilising the inactive state of the channel. This prevents the influx of sodium ions during depolarisation, thereby inhibiting the initiation and propagation of action potentials. The resulting blockade of nerve impulse transmission produces reversible loss of sensory and, at higher concentrations, motor function in the administered area.

Adverse reactions to lidocaine may range from mild, transient sensations to rare, severe systemic events.

Common Side Effects

• Burning or stinging at injection site
• Tingling or numbness extending beyond target area
• Dizziness or light‑headedness
• Nausea or vomiting
• Hypotension or mild bradycardia
• Headache

Serious or Rare Side Effects

• Cardiac arrhythmias including ventricular tachycardia
• Seizures or central nervous system excitation
• Methemoglobinemia with cyanosis
• Severe allergic reactions such as anaphylaxis
• Respiratory depression or apnea
• Systemic toxicity manifesting as confusion or loss of consciousness

When using lidocaine, clinicians should observe several safety measures to minimise risk.

• Allergy assessment: verify no known hypersensitivity to amide‑type local anesthetics.
• Dose limitation: use the lowest effective concentration for the intended procedure.
• Cardiovascular monitoring: observe heart rate and blood pressure during administration.
• Caution in cardiac disease: avoid in patients with severe conduction abnormalities or heart block.
• Hepatic impairment: adjust dosing in patients with significant liver dysfunction.
• Store at ambient temperature: keep in original container, protect from moisture and light.

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

Major Interactions (Avoid)

• Class I antiarrhythmics (e.g., quinidine, procainamide): increase risk of cardiac toxicity.
• CYP3A4 inhibitors such as amiodarone or cimetidine: reduce lidocaine metabolism leading to systemic accumulation.
• Other local anesthetics administered concurrently: may produce additive neuro‑ or cardiotoxicity.

Moderate Interactions (Monitor Closely)

• Beta‑blockers (e.g., propranolol): can potentiate bradycardia and hypotension.
• Central nervous system depressants (e.g., benzodiazepines, opioids): may enhance sedation and respiratory depression.
• Diuretics (e.g., furosemide): may lower plasma protein binding, increasing free lidocaine levels.