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Acute dystonic reaction with low-dose pimozide
M Ernst1, N M Gonzalez, M Campbell
1Department of Psychiatry, New York University Medical Center, NY 10016.
Summary
Children with autism may have unusual susceptibility to extrapyramidal side effects from neuroleptics. This case study highlights the risk of similar reactions to different neuroleptic medications, even after withdrawal.
Area of Science:
- Neuroscience
- Pharmacology
- Developmental Pediatrics
Background:
- Individual susceptibility to neuroleptic-induced side effects is crucial for treatment guidelines.
- Autism Spectrum Disorder (ASD) management often involves neuroleptic medications.
- Extrapyramidal side effects (EPS) are known adverse events associated with neuroleptic use.
Observation:
- A 6.9-year-old autistic male experienced recurrent acute dystonic reactions.
- These reactions occurred during pimozide administration at varying doses (0.096 mg/kg/day and 0.032 mg/kg/day).
- Dystonic reactions persisted even 32 hours after pimozide withdrawal and during subsequent thioridazine treatment.
Findings:
- The patient exhibited an unusual susceptibility to extrapyramidal side effects.
- Acute dystonic reactions were triggered by pimozide and potentially cross-reacted with thioridazine.
- This suggests a potential for similar hypersensitivity across different neuroleptic agents in susceptible children.
Implications:
- Clinicians should be aware of heightened susceptibility to EPS in certain pediatric patients with autism.
- Careful monitoring for adverse reactions is essential when prescribing neuroleptics to children.
- Consideration of cross-reactivity between neuroleptics is important for managing side effects in susceptible individuals.