Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS) Syndrome with Multiple Drugs (Leflunomide and Cefuroxime): A Case Report.

Background: Adverse Drug Reactions (ADRs) are unexpected reactions to a medicine administered in the correct manner and at the proper dosage. Drug Rash with Eosinophilia and Systemic Symptoms syndrome (DRESS syndrome) is a Severe Cutaneous Adverse Reaction (SCAR) type of ADR with complicated clinical features involving several organ systems of the body; frequently involved organs are the liver, kidney, lungs, and other organs. Prompt recognition and correct diagnosis, followed by withdrawal of the causative agent, can promote appropriate treatment, accelerate recovery, and reduce the related morbidity and mortality.

Case presentation: We have, herein, presented a case of a 42-year-old female with a history of leflunomide intake for plantar fasciitis. The patient subsequently developed fever, gastrointestinal tract disturbance, facial edema, liver injury, skin rash, hematologic abnormalities (eosinophilia), hepatosplenomegaly, and lymph node enlargement. The probability of leflunomide-induced DRESS syndrome was rated as "definite", with seven scores graded by RegiSCAR. The suspected causative agent was withdrawn, and the patient was managed symptomatically. Following her management and discharge, she again encountered similar complaints after administration of the cefuroxime tablet. The causality assessment of the reactions was done using the WHO-UMC scale and Naranjo's assessment scale, and a "probable" reaction was found for both drugs.

Conclusion: The presented case contributes to the existing global literature regarding exceptional clinical presentations. Leflunomide and cefuroxime drugs have the potential to cause DRESS syndrome. Thus, they should be handled cautiously, and if such a reaction occurs, it should be reported to the responsible authorities.