The classic presentation is of non-oliguric loss of kidney function in a person using the offending medication. The presence of rash, fever, and eosinophilia (the 'hypersensitivity triad') is supportive, but occurs rarely (<10% cases). AIN should be suspected in all patients who develop non-oliguric acute kidney injury (AKI), and particularly those taking multiple medications. Other causes of AKI, including acute tubular necrosis, acute glomerulonephritis, and acute vascular changes, should be excluded. Referral to a nephrology specialist is advisable.
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