urea hydrogen peroxide: clinical use

Prescribing considerations

• Confirm symptoms are consistent with hardened wax rather than infection, perforation or another ear disorder.
• Ask about previous ear disease, surgery, recent syringing and attempted mechanical wax removal.
• Advise against cotton buds or other objects, which may impact wax or injure the canal.

Contraindications and cautions

• Known or suspected damaged eardrum.
• Dizziness or current ear pain, discharge, inflammation, infection or tinnitus.
• History of ear problems unless used under close clinical supervision.
• Recent ear syringing or canal trauma from attempted mechanical wax removal.
• Hypersensitivity to urea hydrogen peroxide or an excipient.

Monitoring

• Stop if pain or irritation develops.
• Reassess persistent or worsening hearing loss, dizziness, tinnitus or discomfort.
• Check for discharge, inflammation or canal injury before recommending further drops.

Clinical pharmacology

Acts locally in the external auditory canal. Oxygen release disrupts wax; hydrogen peroxide is cerumenolytic, while glycerol and urea soften debris and urea provides mild keratolysis. Systemic pharmacokinetic data are not described.

Formulation and product differences

• The selected product is a clear, straw-coloured, viscous ear-drop preparation containing glycerol and 8-hydroxyquinoline as excipients.
• Presentations may use a glass bottle with pipette applicator or a plastic bottle with nozzle; not all pack sizes may be marketed.