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Morniflumate is the morpholinoethyl ester of niflumic acid, a non-steroidal antiinflammatory drug, derived from nicotinic acid. We studied 112 patients who had experienced cutaneous reactions after using non-steroidal anti-inflammatory drugs. Only two of all the patients who underwent an oral challenge with morniflumate had a positive result to the test. By demonstrating the low incidence of reactions to morniflumate through oral challenges, we suggest that patients with non-steroidal anti-inflammatory drug hypersensitivity may tolerate this drug which would therefore be a useful alternative.