Drug-induced agranulocytosis is a clinical entity characterized by a selective reduction of circulating neutrophils, usually to a level < 0.2 × 109/1 in relation to the administration of the drug. Quinidine is an antiarrhythmic agent widely used on an outpatient basis with some well-known hematological side effects. Its midterm administration has been related to a few cases of agranulocytosis. Herein, we describe the case of a 60-year-old man with atrial fibrillation who presented quinidine-induced agranulocytosis of abrupt onset only 3 days after the exposure to the drug, recovering normal levels of neutrophils during the 3rd hospitalization day. Pathogenic mechanisms are discussed.

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