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Handwriting Analysis Indicates Spontaneous Dyskinesias in Neuroleptic Naïve Adolescents at High Risk for Psychosis

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Acute dyskinesia on starting methylphenidate after risperidone withdrawal.

Chris P Hollis¹, Anne Thompson

¹Department of Developmental Psychiatry, Division of Psychiatry, University of Nottingham, Queens Medical Centre, Nottingham, United Kingdom.

Pediatric Neurology

|October 2, 2007

Summary

A child experienced sudden dyskinesia after starting methylphenidate (Concerta XL) post-risperidone. This highlights potential dopamine receptor interactions and the need for caution when combining psychostimulants and neuroleptics.

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Area of Science:

Neuroscience
Pharmacology
Pediatric Psychiatry

Background:

Stimulant-naïve pediatric patients require careful medication management.
Risperidone withdrawal can alter neurotransmitter receptor sensitivity.
Modified-release methylphenidate is used for attention disorders.

Observation:

A 7-year-old boy developed acute, transient dyskinesia.
The onset occurred within hours of initiating Concerta XL (methylphenidate).
The patient had recently discontinued risperidone therapy.

Findings:

The adverse drug reaction suggests a potential interaction between supersensitive dopamine receptors and methylphenidate.
This mechanism may be exacerbated by recent neuroleptic withdrawal.
Methylphenidate acts as an indirect dopamine agonist.

Implications:

Clinicians should be aware of this potential methylphenidate-induced dyskinesia.
Caution is advised when co-prescribing psychostimulants and neuroleptic medications.
Monitoring for extrapyramidal symptoms is crucial in pediatric patients on combined therapies.