Nitrofurantoin-induced chronic active hepatitis.

BACKGROUND Nitrofurantoin is a commonly prescribed urinary antiseptic. Hepatic injury has been associated with its use. OBJECTIVES To present three patients in whom long-term exposure to the drug resulted in chronic active hepatitis; and to review the epidemiology, clinical immunology, histopathology, pathogenetic features and treatment of previously reported cases. RESULTS Withdrawing nitrofurantoin once the diagnosis was suspected did not lead to remission of the liver disease and glucocorticoids had to be administered. One patient died of liver failure. CONCLUSIONS Awareness of this unusual side effect of nitrofurantoin is important and caution should be taken before prescribing it. Over the past years new insight into the immune nature of this drug has emerged.