cetylpyridinium chloride + lidocaine hydrochloride: clinical use

Prescribing considerations

• Confirm that symptoms reflect a simple mouth ulcer or denture irritation; assess persistent, atypical or worsening lesions.
• Use cautiously with cardiac or hepatic dysfunction.
• Excessive application or use on traumatised mucosa may increase systemic lidocaine exposure.
• The selected product is not indicated for teething.

Contraindications and cautions

• Hypersensitivity to lidocaine, cetylpyridinium chloride, excipients or other amide-type local anaesthetics
• Age under 5 months
• Known or suspected methaemoglobinaemia

Monitoring

• Review persistent or worsening symptoms and examine for trauma, infection or an ill-fitting denture.
• Watch for hypersensitivity, methaemoglobinaemia and systemic local-anaesthetic toxicity where absorption may be increased.

Clinical pharmacology

Lidocaine reversibly inhibits neuronal membrane depolarisation and sensory impulse transmission. Cetylpyridinium chloride is a quaternary pyridinium antiseptic and cationic surfactant. Lidocaine is absorbed through mucosa and predominantly metabolised by the liver.

Formulation and product differences

• The selected preparation is a clear, banana-flavoured oromucosal gel containing ethanol and an eugenol-containing fragrance; it is essentially sodium-free.
• Only one selected product document was supplied, so differences between brands cannot be established here.