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Abstract We report a case of a 50‐year‐old woman with adult‐onset Still's disease (AOSD). Even after receiving steroid pulse therapy and high‐dose oral corticosteroid medication, the patient's serum ferritin level increased, while the number of neutrophils and platelets decreased. However, fever, erythema, sore throat, and arthralgia ceased. Therefore, we administered intravenous tocilizumab (TCZ). However, neutropenia, thrombocytopenia, and exacerbation of hyperferritinemia occurred after the first TCZ infusion. After the second TCZ infusion, the values returned to normal, and we discontinued prednisolone successfully without any flare‐ups of AOSD. We reviewed case reports describing adverse events after TCZ administration in AOSD patients. |
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