Lidoposterin (Lidocaine)

• Lidoposterin, a lidocaine‑based local anesthetic, acts on peripheral nerves to provide temporary loss of sensation in the rectal region.
• Rectal procedures: provides localized anesthesia to facilitate painless insertion of instruments during examinations or minor surgeries.
• Anal fissure treatment: reduces pain and discomfort during topical therapy or clinical assessment of fissures.
• Diagnostic colonoscopy: offers temporary numbing of the rectal mucosa to improve patient comfort during scope insertion.
• Hemorrhoid banding: numbs the area to lessen procedural discomfort and facilitate precise band placement.

• Lidocaine exerts its anesthetic effect by binding to the intracellular portion of voltage‑gated sodium channels on neuronal membranes. This blockade prevents the influx of sodium ions during depolarization, thereby inhibiting the generation and propagation of nerve impulses. The resulting interruption of signal transmission produces reversible loss of sensation in the targeted locally tissue without affecting surrounding structures quickly.

Lidoposterin may cause adverse reactions at the application site and, rarely, systemic effects.

Common Side Effects

• Local irritation: mild burning or stinging sensation at the site of application.
• Transient numbness: temporary loss of sensation lasting a few hours.
• Pruritus: mild itching around the rectal area.
• Headache: mild headache occurring shortly after administration.

Serious or Rare Side Effects

• Allergic reaction: rash, swelling, or anaphylaxis requiring immediate medical attention.
• Methemoglobinemia: abnormal blood discoloration leading to cyanosis and shortness of breath.
• Seizures: central nervous system toxicity manifesting as convulsions.
• Cardiac arrhythmia: irregular heart rhythm potentially leading to cardiovascular compromise.

• Before using Lidoposterin, consider the following precautions to minimize risks and ensure safe administration.
• Assess allergy: verify the patient has no known hypersensitivity to lidocaine or related amides.
• Use minimal effective dose: apply only the amount required for the intended procedure.
• Monitor cardiac function: observe patients with pre‑existing heart disease for any rhythm changes.
• Avoid extensive mucosal damage: do not apply on ulcerated or heavily inflamed rectal tissue.
• Pregnancy: consult a physician before use, as safety data are limited.
• Store at room temperature: keep in the original container, protect from moisture and light.

Lidoposterin can interact with other medicines, altering its efficacy or increasing toxicity.

Major Interactions (Avoid)

• Class I antiarrhythmics (e.g., quinidine): may increase systemic lidocaine levels and risk of toxicity.
• Strong CYP3A4 inhibitors (e.g., ketoconazole): can reduce metabolism, leading to higher plasma concentrations.

Moderate Interactions (Monitor Closely)

• Beta‑blockers: may enhance cardiac depressant effects when combined.
• General anesthetics: additive central nervous system depression may occur.
• Epinephrine: can modify local vasoconstriction and affect drug absorption.