Lidocaina Cloridrato Bioindustria L.I.M. (Lidocaine Hydrochloride)

• Lidocaine is used in the nervous system and cardiac pathways to provide local anesthesia or antiarrhythmic effects.
• Minor surgical or diagnostic procedures: produces localized numbness to facilitate painless intervention.
• Nerve block anesthesia: creates regional loss of sensation for longer duration procedures.
• Ventricular arrhythmias: administered intravenously to stabilize cardiac rhythm in emergency settings.
• Dental procedures: provides topical anesthesia for tooth extractions and other oral surgeries.
• Topical skin procedures: numbs superficial tissue for minor dermatologic interventions.

• Lidocaine exerts its effect by reversibly binding to the intracellular portion of voltage‑gated sodium channels in neuronal and cardiac cell membranes. This blockade prevents the rapid influx of sodium ions during depolarization, thereby inhibiting the generation and propagation of action potentials. In peripheral nerves the result is loss of sensation, while in cardiac tissue it reduces automaticity and conduction, helping to terminate ventricular arrhythmias.

Lidocaine may cause a range of adverse reactions, from mild to severe, depending on dose and route of administration.

Common Side Effects

• Tingling or numbness at the injection site
• Mild dizziness or light‑headedness
• Metallic taste in the mouth
• Transient swelling or erythema at the site

Serious or Rare Side Effects

• Severe allergic reaction (anaphylaxis) with rash, bronchospasm or hypotension
• Cardiac conduction disturbances such as bradycardia, heart block or ventricular depression
• Central nervous system toxicity presenting as seizures, confusion or respiratory depression
• Methemoglobinemia causing cyanosis and reduced oxygen delivery

When using lidocaine, careful assessment and monitoring are essential to minimize risks.

• Assess patient allergy: verify no known hypersensitivity to lidocaine or amide‑type anesthetics
• Monitor cardiac status: observe ECG and blood pressure when administered intravenously
• Use lowest effective dose: titrate to achieve desired anesthesia while minimizing systemic exposure
• Avoid in severe hepatic impairment: reduced metabolism may increase toxicity
• Consider alternative in patients with severe heart block: lidocaine can exacerbate conduction defects
• Store at controlled room temperature: keep in original container, protect from moisture and light

Lidocaine can interact with several drug classes, requiring attention to avoid additive effects.

Major Interactions (Avoid)

• Class I antiarrhythmics (e.g., quinidine, procainamide): additive cardiac depressant effects
• Beta‑blockers (e.g., propranolol): may enhance bradycardia and hypotension
• CYP3A4 inhibitors (e.g., ketoconazole, erythromycin): increase plasma lidocaine concentrations

Moderate Interactions (Monitor Closely)

• CYP1A2 inducers (e.g., carbamazepine, rifampin): may lower lidocaine levels, reducing efficacy
• Non‑steroidal anti‑inflammatory drugs (NSAIDs): may increase bleeding risk at injection sites
• General anesthetics (e.g., propofol, volatile agents): can potentiate central nervous system depression