Nonsteroidal anti-inflammatory drug induced renal syndromes.

Nonsteroidal anti-inflammatory drugs (NSAIDs) may cause acute renal failure from unopposed vasoconstriction or acute interstitial nephritis. NSAID induced hemodynamic renal failure is characterized by sudden oliguria, often with decreased fractional excretion of sodium, occurring in patients with decreased effective circulating fluid volume or preexisting renal disease. Allergic interstitial nephritis from NSAIDs may occur at any time during therapy with the drugs and may present as renal failure with or without the nephrotic syndrome. Although chronic renal failure has been reported, both renal syndromes usually resolve when treatment with the NSAID is discontinued. Renal function should be measured soon after initiation of therapy in patients at risk for the hemodynamic effects of the drugs and periodically thereafter. Patients should be warned about the potential toxicity of the drugs.