Have you ever experienced ringing in the ears, dizziness, or muffled hearing after starting a medication? These symptoms are not merely a coincidence; they can be an important sign that your ears are being affected by ototoxic drugs. An ototoxic drug is a general term for medications that exert toxic effects on the delicate hair cells or the auditory nerve of the inner ear organs, namely the cochlea and vestibular system, causing hearing loss or dizziness.
More medications have ototoxicity than is commonly realized, and key classes include the following.
First, there are aminoglycosides, a specific class of antibiotics. Gentamicin and tobramycin belong here, and they are mainly used for serious infections. These drugs can directly damage the hair cells of the cochlea, causing permanent hearing loss or tinnitus. Furthermore, they also affect the vestibular system responsible for balance, leading to severe dizziness and paresthesia of balance.
Second, among diuretics, there are strong loop diuretics such as furosemide. These medications increase urine volume by regulating ion transport in the kidneys. When used excessively, they temporarily reduce the function of the stria vascularis in the cochlea, potentially causing reversible hearing loss or tinnitus. In most cases, recovery occurs after discontinuing the drug.
Third, nonsteroidal anti-inflammatory drugs and aspirin, which are widely used, can also exhibit ototoxicity when taken in excessive doses or used for a long period. These drugs alter ear blood flow or impair cochlear function, causing temporary tinnitus or hearing loss. In many cases, symptoms improve once the dose is reduced or stopped.
Fourth, certain anticancer drugs, such as cisplatin used in cancer treatment, possess potent ototoxicity. These medications can severely damage outer hair cells, causing permanent and irreversible high-frequency hearing loss, with the risk of damage increasing in proportion to the dose and treatment duration.
Ear damage caused by these ototoxic drugs is a result of multiple risk factors acting in combination, beyond just the toxicity of the drug itself. High drug doses, long-term use, reduced kidney function with delayed drug excretion, preexisting hearing loss, advanced age, concurrent use of multiple ototoxic drugs, and genetic factors can all increase the risk of damage. When such symptoms are suspected, it is crucial to consult a specialist to explore drug adjustments or alternatives, and to protect ear health through appropriate evaluation such as audiometry. Just as Donguibogam warned against the toxicity of medicines and emphasized cautious administration, modern medicine also focuses on caring for a patient's whole-body health by closely examining the adverse effects hidden behind the benefits of drugs.
