ArticleSchizophrenia bulletin2026
Late-Onset Neutropenia in Clozapine Users: Unrelated or Drug-Induced? A Case-Registry Analysis of Incidence, Characteristics, and Rechallenge Attempts.
Article in Schizophrenia bulletin, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Authors and funding
10 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
background and hypothesisClozapine treatment carries a risk of blood dyscrasias (BD) and requires indefinite monitoring in many jurisdictions, a major factor in its under-utilization. Although previous studies suggest BD risk is highest early in treatment, BD events have also been reported after many years. This study compares early vs late (>6 months) suspected blood dyscrasias (SBD) and examines rechallenge outcomes as a marker for clozapine-related causation. STUDY
designA retrospective analysis of electronic health records from a large UK mental health service gathered demographic data, characteristics of SBD events, and outcomes of clozapine rechallenge, defined as reinitiation after SBD-related discontinuation. These variables were compared between early- and late-onset SBD groups using a 6-month treatment duration cutoff. STUDY
resultsOf 130 patients with SBD leading to clozapine cessation, 59 had early-onset SBD. The incidence rate before 6 months was 5.54% per year vs 0.53% after 6 months, reflecting an incidence rate ratio of 10.4. Early-onset patients were younger, received lower clozapine doses, and had fewer concurrent antipsychotics. Of 81 rechallenge attempts, 71 (87.7%) were successful, with a mean follow-up of 2.5 years. No significant differences in characteristics or rechallenge outcomes were found between the early- and late-onset groups.
conclusionsThough less frequent, late-onset SBD shares similar characteristics with early-onset SBD and has a comparable risk of recurrence on clozapine rechallenge. Vast majority of clozapine rechallenges are successful, including early-onset BD, suggesting they are not clozapine-induced. However, clozapine-induced BD, defined by recurrence upon rechallenge, may rarely occur even after years of treatment.
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