Acetic Acid 2% (Ear Drops)

SCOPE: this is the page's primary indication and route — UK SPC §4.2, verbatim: 'Adults, children, aged 12 years and above, and the elderly. For treatment of superficial infections of the outer ear: one metered dose (60 milligrams) to be administered directly into each affected ear at least three times daily (morning, evening and after swimming, showering or bathing). Maximum dosage frequency one spray every 2 - 3 hours. Treatment should be continued until two days after symptoms have disappeared but no longer than 7 days.' || WHY maxDose IS EMPTY: the only ceiling in the source caps FREQUENCY ('one spray every 2 - 3 hours'), not the size of a dose, so it belongs in the frequency field rather than in a maximum-dose field. It is quoted verbatim there. || PRIMING AND SHELF LIFE (§4.2, verbatim): 'Before using the product for the first time, prime the pump by depressing actuator 6 - 10 times until a fine spray is obtained. Use within 1 month of first actuation. If more than one week has elapsed since the last use, dispose of the contents of the pump chamber by 1 or 2 depressions of the actuator.' || The US otic solution label does give a drops regimen — verbatim: 'Carefully remove all cerumen and debris to allow acetic acid otic solution to contact infected surfaces directly. To promote continuous contact, insert a wick of cotton saturated with acetic acid otic solution into the ear canal; the wick may also be saturated after insertion. Instruct the patient to keep the wick in for at least 24 hours and to keep it moist by adding 3 drops to 5 drops of acetic acid otic solution every 4 hours to 6 hours. The wick may be removed after 24 hours but the patient should continue to instill 5 drops of acetic acid otic solution 3 times or 4 times daily thereafter, for as long as indicated.' — but that dose is a strength-free DROP COUNT: the label text never states a percentage and the product name is only 'Acetic Acid', so the strength is not pinned and the count cannot be published as a dose.

dosePerKg is null and concentration is null because this is a fixed topical dose, not a weight-based one. || UK SPC §4.2 gives a single posology covering 'Adults, children, aged 12 years and above, and the elderly' — one metered dose (60 milligrams) into each affected ear. There is therefore NO separate paediatric dose for 12-17 year olds; they take the adult dose. || UNDER 12 YEARS — no dose is stated in the UK source. §4.3, verbatim: 'Not recommended for children under 12 years of age without medical advice.' || The US otic solution label says 'In pediatric patients, 3 drops to 4 drops may be sufficient due to the smaller capacity of the ear canal' and 'Safety and effectiveness in pediatric patients below the age of 3 years have not been established' — but that product's acetic acid strength is not stated anywhere in the bundle, so no drop count is published here. || For any child, verify against a children's formulary and confirm the tympanic membrane is intact before instilling anything into the ear canal.