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  • Title: Safety of a Clozapine Trial Following Quetiapine-Induced Leukopenia: A Case Report.
    Author: Almaghrebi AH.
    Journal: Curr Drug Saf; 2019; 14(1):80-83. PubMed ID: 30084338.
    Abstract:
    BACKGROUND: The clozapine-derivative quetiapine has been shown in some cases to cause leukopenia and neutropenia. CASE PRESENTATION: We reported on a case of a young female diagnosed with treatment-resistant schizophrenia. After failed trials of three antipsychotic medications and despite a history of quetiapineinduced leukopenia, clozapine treatment was introduced due to the severity of the patient's symptoms, the limited effective treatment options, and a lack of guidelines on this issue. RESULT: Over a ten-week period of clozapine treatment at 700 mg per day, the patient developed agranulocytosis. Her white blood cell count sharply dropped to 1.6 × 109 L, and her neutrophils decreased to 0.1 × 109 L. There had been no similar reaction to her previous medications (carbamazepine, risperidone, and haloperidol). CONCLUSION: The safety of clozapine in a patient who has previously experienced leukopenia and neutropenia with quetiapine requires further investigation. Increased attention should be paid to such cases. Careful monitoring and slow titration are advisable.
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