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Rabbit syndrome secondary to risperidone.

Jenifer S Hoy1, Bruce Alexander

  • 1Department of Pharmacy, Iowa City Department of Veterans Affairs Medical Center, USA.

Pharmacotherapy
|April 10, 2002
PubMed
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Rabbit syndrome, a rare side effect of risperidone, involves rhythmic mouth movements. Anticholinergic treatment and switching antipsychotics can effectively manage this condition.

Area of Science:

  • Neuroscience
  • Psychiatry
  • Pharmacology

Background:

  • Risperidone is an atypical antipsychotic used for major depressive disorder.
  • Extrapyramidal side effects (EPS) are known complications of antipsychotic medications.
  • Rabbit syndrome is an uncommon form of EPS characterized by oral-buccal movements.

Observation:

  • A 38-year-old male patient developed rabbit syndrome after 4 months of risperidone treatment.
  • The patient's condition involved rhythmic movements of the mouth.
  • This syndrome is associated with dopamine D2 receptor blockade by antipsychotics.

Findings:

  • Rabbit syndrome responded to anticholinergic treatment in the reported case.
  • Literature review indicates a rise in rabbit syndrome cases linked to risperidone.

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  • The exact mechanism of rabbit syndrome remains unclear.

    • Implications:

    • Anticholinergic medications may be a viable treatment option for risperidone-induced rabbit syndrome.
    • Switching to alternative atypical antipsychotics, such as olanzapine, may resolve the syndrome.
    • Further research is needed to elucidate the precise pathophysiology of rabbit syndrome.