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BACKGROUND: DRESS syndrome is a severe adverse reaction to a drug, which can cause multiorgan involvement when it is associated with the ingestion of allopurinol, which is a drug used in clinical practice for the treatment of hyperuricemia and gout, with a mortality rate of 10%. CLINICAL CASE: A 76-year-old female patient who, after taking allopurinol due to hyperuricemia, showed bumby, red, over raised, pruritic lesion on the body and the face. In addition, in the following 24 hours, she also presented edema and desquamation mainly in the face. With the help of complementary tests, such as leukocytosis with eosinophilia, we observed a deterioration of her renal function. However, after the suspension of the drug and the administration of corticosteroids patient improved. CONCLUSIONS: DRESS syndrome has a high risk of lethality; therefore, it is extremely important that physicians take the right steps such as the rapid suspension of drugs as well as therapeutic measurements to help minimize the risk. [ABSTRACT FROM AUTHOR]