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Clozapine effects on force control in schizophrenic patients

P B Vrtunski1, P E Konicki, G E Jaskiw

  • 1Cleveland VA Medical Center, Brecksville, OH 44141, USA. vrtunski.p_bart@cleveland.va.gov

Schizophrenia Research
|November 24, 1998
PubMed
Summary

Clozapine treatment in schizophrenia patients significantly impairs fine motor control, particularly force control (FC) function. This deficit is dose-dependent and distinct from typical antipsychotic drugs, with transient drowsiness and later myoclonic features observed.

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Area of Science:

  • Neuroscience
  • Psychopharmacology
  • Movement Disorders

Background:

  • Previous research indicated differences in force control (FC) between schizophrenic patients on typical antipsychotic drugs (APD) and clozapine.
  • Clozapine treatment was linked to reduced fine motor control capacity.

Purpose of the Study:

  • To confirm earlier findings on clozapine's effect on FC in treatment-refractory schizophrenic patients.
  • To investigate the temporal dynamics and dose-dependency of clozapine's impact on motor control.

Main Methods:

  • A test-retest study involving 41 treatment-refractory patients.
  • Repeated FC testing during the initial 6-8 weeks of clozapine titration in 10 patients.

Main Results:

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  • The FC deficit was confirmed and primarily attributed to clozapine treatment.
  • Two distinct clozapine effects were identified: initial transient drowsiness and a later dose-dependent emergence of myoclonic features.

    • Conclusions:

    • Clozapine significantly impairs force control function in schizophrenic patients.
    • The motor side effects of clozapine appear to have distinct temporal and dose-dependent characteristics.