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Related Experiment Videos

Valproic acid-induced neutropenia.

Kimi S Vesta1, Patrick J Medina

  • 1Department of Pharmacy, Clinical and Administrative Sciences, College of Pharmacy, University of Oklahoma, Oklahoma City, OK 73190-5040, USA. Kimi-Vesta@ouhsc.edu

The Annals of Pharmacotherapy
|May 30, 2003
PubMed
Summary

Valproic acid (VPA) can cause severe neutropenia, a dangerous drop in infection-fighting cells. Monitoring blood counts is crucial during VPA therapy for epilepsy patients.

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Area of Science:

  • Neurology
  • Pharmacology
  • Hematology

Background:

  • Valproic acid (VPA) is a commonly used antiepileptic drug.
  • Neutropenia, a decrease in neutrophils, is a known but typically mild side effect of VPA.
  • Severe neutropenia poses a significant risk of infection.

Observation:

  • A 56-year-old woman with a brain abscess and seizures was treated with VPA.
  • She rapidly developed severe neutropenia, with an absolute neutrophil count as low as 47 cells/mm³.
  • Neutrophil counts normalized after VPA discontinuation.

Findings:

  • The Naranjo probability scale suggests VPA was the probable cause of severe neutropenia.
  • This case demonstrates a rare instance of severe neutropenia associated with VPA therapy.
  • The patient experienced significant susceptibility to infection due to profound neutropenia.

Implications:

  • Clinicians should consider the risk of severe neutropenia even with generally well-tolerated drugs like VPA.
  • Regular monitoring of complete blood cell counts is essential for patients on VPA.
  • Prompt recognition and management of VPA-induced neutropenia can prevent serious infectious complications.

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