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Related Experiment Video

Updated: Feb 10, 2026

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[Valproate induced parkinsonism]

Y C Park-Matsumoto1, T Tazawa

  • 1Department of Neurology, Akiba Memorial Hospital, Saitama-ken, Japan.

No to Shinkei = Brain and Nerve
|March 11, 1998
PubMed
Summary
This summary is machine-generated.

Sodium valproate (VPA) can cause parkinsonism, a rare side effect. This study presents three cases where parkinsonism resolved after VPA discontinuation or dose reduction, suggesting VPA-induced parkinsonism is under-recognized.

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Area of Science:

  • Neurology
  • Pharmacology

Background:

  • Sodium valproate (VPA) is a widely used antiepileptic and mood-stabilizing drug.
  • Adverse effects of VPA are common, but parkinsonism is considered a very rare complication.

Observation:

  • Three elderly patients (70-75 years) developed parkinsonian symptoms including rigidity, akinesia, and postural instability after VPA administration.
  • Symptoms emerged after 7 to 41 months of VPA treatment at a dose of 800 mg/day.
  • Parkinsonism resolved within 1-6 months after VPA discontinuation or dose reduction.

Findings:

  • VPA-induced parkinsonism, though rare, can occur in elderly patients with prolonged treatment.
  • The underlying pathophysiologic mechanisms of this reaction remain unclear.
  • Predisposing factors may include advanced age, long-term VPA use, and therapeutic serum VPA levels.

Implications:

  • VPA-induced parkinsonism should be considered in the differential diagnosis of parkinsonian symptoms in patients taking VPA.
  • Increased awareness and recognition are crucial for timely diagnosis and management.
  • Further research into the mechanisms and risk factors is warranted.