Since the 19th century, many therapeutic drugs have been known to affect hearing. Known as ototoxic drugs, many are used today in clinical situations despite these negative side effects because they are effective in treating serious, sometimes life-threatening conditions. Research has shown that exposure to certain chemicals in the workplace may also negatively affect how the ear functions, potentially causing hearing loss or balance problems, regardless of noise exposure. Substances containing ototoxicants include certain pesticides, solvents, metals and pharmaceuticals. The risk of hearing loss they pose can be increased when workers are exposed to these chemicals while working around
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