NameAcetic Acid
Classes Antiinfective Agent
Dermatological/Topical Agent
Otic Antiinfective Agent
Otic Preparation
Topical Antiinfective Agent
Diseases Ear Infection
Infectious Disease

Acetic Acid

Acetic acid is a topical medication that belongs to the class of organic acids. Its mechanism of action involves the disruption of cell membranes and inhibition of bacterial growth by altering the pH of the local environment.


Acetic acid is indicated for the treatment of external ear infections, including acute and chronic otitis externa caused by susceptible bacteria. It is also used to clean and dry the ear canal, removing earwax and debris.


The dosage and administration of acetic acid may vary depending on the specific condition being treated and the severity of the infection. It is typically administered as drops in the ear canal or applied topically to the affected area. The recommended dosage is generally 2-3 drops in the affected ear 3-4 times per day, or as directed by a healthcare professional.


Adverse reactions to acetic acid are generally mild and include stinging, burning, and irritation of the ear canal. Less commonly, allergic reactions may occur, which can result in itching, redness, and swelling. If these symptoms occur, treatment should be discontinued and a healthcare professional should be consulted.


  • Acetic acid is for external use only and should not be ingested or applied to the eyes or mucous membranes.
  • Patients with a history of hypersensitivity or allergic reactions to acetic acid or any of its components should not use this medication.
  • Use with caution in patients with perforated eardrums or other ear canal injuries, as acetic acid may cause irritation or pain.
  • Acetic acid should not be used in combination with other ear drops or medications without the advice of a healthcare professional.
  • Use during pregnancy or breastfeeding should only be done under the direction of a healthcare professional.



Acetic acid is contraindicated in patients with a known hypersensitivity or allergy to the medication or any of its components.


Acetic acid should not be used in patients with a perforated eardrum or other ear canal injuries.