DRESS syndrome following furosemide administration: An unusual association

Introduction Drug reaction with eosinophilia and systemic symptoms (DRESS) is a severe and rare adverse drug reaction. Several drugs are known to induce DRESS. Furosemide, a sulfonamide loop diuretic drug, is known to induce hypersensitive reactions such as bullous eruptions, acute generalized exanthematous pustulosis and lichenoid eruptions, but rarely DRESS. We describe herein a case of furosemide-induced DRESS that recurred after bumetanide administration. Case report A 67-year-old man was admitted to the nephrology department for hypertension, gout and chronic renal failure. He received a multidrug therapy including captopril, nifedipine, allopurinol and furosemide. Six weeks after starting this treatment, he developed a maculopapular itchy and edematous skin reaction, facial edemaand fever. The laboratory findings showed 2200/mm3 of eosinophils (20%). Creatinine clearance decreased from 18.9 to 14.4 mL/min. Lactate dehydrogenase was at 600 IU/L (normal range 190-390 IU/L). Chest X-ray showed an interstitial lung injury. Skin biopsy findings were in accordance with a hypersensitive reaction. Furosemide was withdrawn and symptoms resolved completely three weeks later. A patch test with furosemide performed six weeks later was negative. The patient was given bumetanide, another sulfonamide loop diuretic, with recurrence of symptoms two months later. Bumetanide was withdrawn with a complete resolution of both clinical and biological symptoms within three weeks. Conclusion We add to the literature another case of furosemide-induced DRESS with the particularity of cross reactivity with bumetanide.