Naproxen-Associated Acute Kidney Injury in UTI Patients

Mechanism and Risk Factors

• The American College of Nephrology recommends avoiding NSAIDs like naproxen in patients with urinary tract infections (UTIs) due to the increased risk of acute kidney injury (AKI) through mechanisms including inhibition of prostaglandin synthesis, renovasoconstriction, and interstitial nephritis 2
• UTIs compromise kidney function through inflammatory responses, potential infection ascent, and systemic effects like fever and dehydration, with naproxen use exacerbating these effects 1, 2
• The combination of UTI and naproxen creates a "double hit" to kidney function, with substantially higher risk in patients with advanced age, pre-existing kidney disease, dehydration, concurrent use of other nephrotoxic medications, and use of ACE inhibitors or ARBs 1, 2, 5, 6

Management and Prevention

• The National Kidney Foundation suggests avoiding naproxen and other NSAIDs in patients with active UTIs, and considering acetaminophen as a first-line alternative for pain management 2, 5
• For patients who have been exposed to both UTI and naproxen, monitoring kidney function, discontinuing naproxen immediately if signs of kidney dysfunction appear, and ensuring adequate hydration are crucial 1, 4
• Patient education about avoiding over-the-counter NSAIDs during UTI episodes is recommended to prevent AKI 1

Monitoring

• The Kidney Disease: Improving Global Outcomes (KDIGO) guidelines recommend monitoring serum creatinine, BUN, urine output, and electrolytes in patients who have been exposed to both UTI and naproxen 1