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BMC Psychiatry
Published in: BMC Psychiatry 1/2023

Open Access 01-12-2023 | Neutropenia | Research

Valproate-related neutropenia and lithium-related leukocytosis in patients treated with clozapine: a retrospective cohort study

Authors: Chia-Chun Yang, Xi-Yu Wang, Po-Han Chou, Ching-Hua Lin

Published in: BMC Psychiatry | Issue 1/2023

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Abstract

Background

Neutropenia is a noteworthy side effect of clozapine, which might warrant this drugs’ discontinuance for safety. Studies have revealed that the risk of neutropenia increases with concurrent administration of valproate, but the evidence was limited. Conversely, lithium may have an ameliorating effect on clozapine-induced neutropenia. This study explored the effects of valproate and lithium on white blood cell counts in patients treated with clozapine.

Methods

We retrospectively investigated the electronic medical records from one tertiary psychiatric hospital in Taiwan and enrolled patients discharged between January 1, 2006, and December 31, 2017, with clozapine prescriptions. We scrutinized their demographic data, medications, and hematological results at discharge and during follow-up outpatient clinic visits over the subsequent 3 years. Patients were classified into four groups: clozapine only (CLO), clozapine and valproate (CLO + VAL), clozapine and lithium (CLO + Li), and clozapine, valproate, and lithium (CLO + VAL + Li). We also identified hematological events (neutropenia or leukocytosis) of these patients during outpatient follow-ups.

Results

Of the included 1084 patients, 55(5.1%) developed neutropenia. Concurrent valproate use (odds ratio [OR] = 3.49) and older age (p = .007) were identified as risk factors. Moreover, 453 (41.79%) patients developed leukocytosis. Younger age; male sex; and concurrent use of lithium (OR = 3.39, p < .001), clozapine daily dosage, and benzodiazepines were the risk factors for leukocytosis.

Conclusion

Concurrent valproate use and older age are associated with the development of neutropenia in patients treated with clozapine. Concurrent lithium usage, younger age, male sex, and concurrent benzodiazepine use might be related to leukocytosis.
Appendix
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Metadata
Title
Valproate-related neutropenia and lithium-related leukocytosis in patients treated with clozapine: a retrospective cohort study
Authors
Chia-Chun Yang
Xi-Yu Wang
Po-Han Chou
Ching-Hua Lin
Publication date
01-12-2023
Publisher
BioMed Central
Published in
BMC Psychiatry / Issue 1/2023
Electronic ISSN: 1471-244X
DOI
https://doi.org/10.1186/s12888-023-04659-2

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