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Acute tubulointerstitial nephritis — usually drug-induced kidney inflammation (antibiotics, NSAIDs, PPIs). The allergy-like pattern, diagnosis, and why stopping the culprit matters.
Evidence reviewed & updated: 2026-08 — reflects the latest published trials and guidelines.
Acute tubulointerstitial nephritis (ATIN) is a common cause of acute kidney injury — most often a drug allergy-like reaction involving antibiotics, NSAIDs, and proton pump inhibitors. Classic clues: AKI days-weeks after starting a drug, sometimes with fever, rash, and white cells in urine. Stopping the culprit drug is the treatment; steroids help in selected cases.
ATIN is an immune reaction where the kidney's tubules and interstitium become inflamed — classically as a drug hypersensitivity. The common culprits: beta-lactam antibiotics (penicillins, cephalosporins), sulfonamides, fluoroquinolones, NSAIDs (including the now-over-the-counter ones), proton pump inhibitors (omeprazole and family), allopurinol, and immune checkpoint inhibitors (a growing cause in cancer care).
The AKI develops days to weeks after exposure — the drug must be actively sought in the history, including OTC NSAIDs and 'heartburn' pills patients often forget to mention.
The classic presentation includes fever, rash, and eosinophilia — but the full triad appears in only about 10% of cases. More typical: a rising creatinine with a bland or white-cell-heavy urinalysis (sterile pyuria), sometimes with proteinuria that's usually modest.
If urine white cells are present WITHOUT infection, ATIN is the leading suspect. Kidney biopsy confirms (interstitial infiltrate with eosinophils) and assesses fibrosis — which predicts recovery.
The cornerstone: stop the offending drug — kidney function usually improves within days to weeks. Steroids (e.g., prednisone 1 mg/kg for several weeks, tapered) are used in severe cases, when no recovery follows drug removal, or for checkpoint-inhibitor ATIN, though evidence is observational.
Recovery is good in most (especially drug-related ATIN caught early); some patients are left with chronic kidney disease, and a minority need dialysis. Chronic interstitial nephritis from long-term PPI use or lithium is a slower, more insidious process.
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