Nulbia (Lidocaine, Prilocaine)

Nulbia is a topical local anesthetic used on the skin and superficial lesions.

• Minor skin procedures: provides rapid, reversible numbness to facilitate incisions, suturing, or biopsies.
• Superficial skin lesions: reduces pain associated with burns, abrasions, or dermatitis.
• Dermatologic interventions: eases discomfort during laser therapy, cryotherapy, or chemical peels.

• Lidocaine and prilocaine block voltage‑gated sodium channels in neuronal membranes, inhibiting the initiation and propagation of nerve impulses. This interruption of sodium influx prevents depolarization of peripheral sensory fibers, resulting in a reversible loss of sensation in the applied area.

Topical application of Nulbia may be associated with several adverse reactions.

Common Side Effects

• Mild skin irritation: redness, itching, or burning at the application site.
• Localized edema: slight swelling where the product is applied.
• Transient numbness: prolonged sensation loss beyond the intended period.

Serious or Rare Side Effects

• Allergic reaction: urticaria, angioedema, or anaphylaxis requiring immediate medical attention.
• Methemoglobinemia: bluish discoloration of skin or mucous membranes, especially with extensive use.
• Systemic toxicity: dizziness, seizures, or cardiac arrhythmias if absorbed in large amounts.

When using Nulbia, consider the following safety measures.

• Application area: limit to intact skin and avoid mucous membranes.
• Quantity: use only the amount prescribed to reduce systemic absorption.
• Age restrictions: avoid use in infants and young children unless directed by a clinician.
• Concomitant anesthetics: do not combine with other topical anesthetics to prevent cumulative toxicity.
• Allergies: screen for known hypersensitivity to lidocaine, prilocaine, or formulation excipients.
• Store below 25°C: keep in the original packaging, protect from moisture and direct sunlight.

Nulbia may interact with other substances that affect sodium channel function or systemic absorption.

Major Interactions (Avoid)

• Systemic local anesthetics: concurrent use can increase risk of toxicity.
• CYP450 inhibitors: may alter metabolism of lidocaine, raising plasma levels.

Moderate Interactions (Monitor Closely)

• Vasoconstrictors (e.g., epinephrine): can modify local blood flow and drug absorption.
• Certain antiarrhythmic agents: may potentiate cardiac effects if systemic absorption occurs.
• Alcohol or CNS depressants: may enhance central nervous system depression in case of overdose.