Ear drops, a dosage form, are widely used in clinical practice for the treatment of otitis externa and otitis media, and play an anti-infective and anti-inflammatory role. Types of ear drops commonly used in the clinic include ofloxacin ear drops, boric acid alcohol ear drops, lomefloxacin hydrochloride ear drops, etc. All of these ear drops contain a variety of antibiotics or antibacterial ingredients within the composition, which can play a very good antibacterial effect after use. Patients who have itching, pain, odor and other manifestations of the external auditory canal should promptly go to the Department of Otorhinolaryngology, through the doctor’s examination to exclude organic lesions of the ear canal, remove the retained secretions and necrotic tissues to clarify the diagnosis, standardize the use of medication and treatment. It is forbidden to use ear drops of unknown composition for self-medication.