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Drug-induced dystonia.

C Swett

    The American Journal of Psychiatry
    |May 11, 1975
    PubMed
    Summary

    Antipsychotic medications like phenothiazines and butyrophenones can cause dystonia, a movement disorder. This risk is higher in men, younger patients, and those on high doses of certain drugs, particularly haloperidol.

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    Area of Science:

    • Psychiatry
    • Pharmacology
    • Neurology

    Background:

    • Antipsychotic medications are widely used for psychiatric conditions.
    • Extrapyramidal symptoms, including dystonia, are known side effects.
    • Understanding risk factors for drug-induced dystonia is crucial for patient safety.

    Purpose of the Study:

    • To investigate the incidence and risk factors of dystonia in psychiatric inpatients receiving specific antipsychotic drug classes.
    • To identify which antipsychotic agents and patient characteristics are associated with a higher risk of developing dystonia.

    Main Methods:

    • Retrospective analysis of 1,152 psychiatric inpatients treated with phenothiazines, butyrophenones, or thioxanthenes.
    • Documentation of dystonia development and attribution to study medications.
    • Statistical analysis to determine associations between drug exposure, patient demographics, and dystonia occurrence.

    Main Results:

    • 116 out of 1,152 patients (10.1%) developed dystonia.
    • Haloperidol and long-acting injectable fluphenazines showed the highest frequencies of dystonia.
    • Dystonia was more prevalent in males and younger patients across all at-risk individuals.
    • For chlorpromazine, high dosage, male sex, and younger age were significant risk factors.

    Conclusions:

    • Certain antipsychotics, notably haloperidol and injectable fluphenazines, are associated with a higher risk of dystonia.
    • Male sex and younger age are significant risk factors for developing drug-induced dystonia.
    • Clinicians should consider these risk factors when prescribing these antipsychotics, especially at high doses.

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