What organ do antibiotics damage?

Antibiotics can potentially damage several organs as side effects, but the organs most commonly affected are the kidneys, liver, and gut microbiome, with specific antibiotics having different risk profiles, though most people take antibiotics without organ damage when used correctly. The kidneys are vulnerable because many antibiotics are filtered and excreted by kidneys, and high doses or prolonged use of drugs like aminoglycosides, vancomycin, and some penicillins can cause acute kidney injury. The liver can be affected because it metabolizes many drugs, and antibiotics like amoxicillin-clavulanate, isoniazid for TB, and macrolides can cause drug-induced liver injury with elevated liver enzymes, rarely severe. The gut is always affected because antibiotics kill beneficial bacteria along with harmful ones, disrupting microbiome, which can cause diarrhea, yeast infections, and in severe cases Clostridioides difficile infection that causes severe colitis. Less commonly, some antibiotics can damage inner ear and cause hearing loss, like aminoglycosides, tendons like fluoroquinolones, and cause allergic reactions affecting skin and lungs. The risk of organ damage increases with high doses, long courses, dehydration, preexisting kidney or liver disease, older age, and interactions with other drugs. To protect organs, stay hydrated, take antibiotics exactly as prescribed, complete the course, avoid alcohol with certain antibiotics, inform your doctor of existing kidney or liver issues, and support gut health with probiotics after treatment if recommended. Most organ effects are reversible when caught early.