Ear drops are commonly used to treat otitis externa and otitis media. Ear drops are commonly used in the clinic, such as ofloxacin ear drops and lomefloxacin ear drops, which are fluoroquinolone antimicrobial drugs with the effect of anti-Gram-positive bacteria, Gram-negative bacteria, mycoplasma and chlamydia, and have better antimicrobial effect on bacterial infections of the external auditory canal, especially otitis externa and otitis media caused by Staphylococcus aureus, Streptococcus aureus, and other miscellaneous bacteria. At the same time, ear drops can rinse the external auditory canal and have the effect of reducing to disappearing the purulent secretions from the external auditory canal. The usual course of treatment is two weeks, and the usual usage is 3-5 drops in the ear three times a day. While the ear drops are being used topically, the external ear canal needs to be kept clean and water needs to be avoided.