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Fenofibrate-Induced Osmotic Nephropathy: A Novel Mechanism of Acute Kidney Injury

Raymond Lin1, Seethalakshmi Viswanathan2, Nikki L Wong3

  • 1Nepean Kidney Research Centre, Nepean Hospital, New South Wales, Australia; Sydney Medical School, University of Sydney, New South Wales, Australia.

American Journal of Kidney Diseases : the Official Journal of the National Kidney Foundation
|May 14, 2025
PubMed

Insights

Fibrates, like fenofibrate, can cause acute kidney injury through osmotic nephropathy, especially in patients with severe kidney impairment. This case highlights a potential new mechanism for drug-induced kidney damage.

Area of Science:

  • Nephrology
  • Pharmacology

Background:

  • Fibrates are commonly used for dyslipidemia and cardiovascular risk.
  • Fibrates are known to cause reversible creatinine elevations and acute kidney injury (AKI).
  • The exact mechanism of fibrate-induced renal effects remains unclear.

Observation:

  • A case of AKI occurred in a patient with severe renal impairment receiving an unadjusted dose of fenofibrate.
  • Kidney biopsy revealed extensive isometric vacuolization in tubular epithelial cells, indicative of osmotic injury.
  • No other contributing factors like hyperglycemia or IV agents were identified.

Findings:

  • Fenofibrate was identified as the likely cause of AKI due to the drug's administration timing and the observed injury.
  • The patient's AKI resolved in a timeframe consistent with the fenofibrate metabolite's half-life.
  • The biopsy findings suggest a novel mechanism of fenofibrate-associated AKI via osmotic nephropathy.

Implications:

  • This case suggests a potential new pathway for fenofibrate-induced kidney damage.
  • Understanding this mechanism is crucial for managing patients with dyslipidemia and renal impairment.
  • Further research into fenofibrate's renal effects and osmotic nephropathy pathogenesis is warranted.
Keywords:
Acute kidney injuryFenofibrateFibrateOsmotic nephropathyOsmotic tubulopathy

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