Exterol ear drops are used to help remove hardened wax from the ear canal. Exterol is suitable for use by adults, children & the elderly. The active ingredient is urea hydrogen peroxide. It works by breaking down the ear wax into small pieces. Excessive, hardened ear wax is quite common. It causes problem when it builds up & blocks the ear canal. The first symptom is usually a feeling of discomfort & fullness in the ear. This can become painful & cause dizziness & some loss of hearing if left untreated.