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Related Experiment Videos

Clozapine and negative symptoms. An open study.

P M Llorca1, C Lancon, J Farisse

  • 1C.H. Sainte Marie, Clermont-Ferrand, France.

Progress in Neuro-Psychopharmacology & Biological Psychiatry
|June 3, 2000
PubMed
Summary

Clozapine shows significant efficacy in treating negative symptoms of schizophrenia, including in deficit patients. This effect on negative symptoms was delayed compared to other symptom dimensions.

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Area of Science:

  • Psychiatry
  • Neuroscience
  • Pharmacology

Background:

  • Clozapine is an atypical antipsychotic effective for treatment-resistant schizophrenia.
  • A significant challenge in schizophrenia treatment is the limited efficacy of antipsychotics on negative symptoms.

Purpose of the Study:

  • To evaluate clozapine's efficacy on negative symptoms in schizophrenia patients.
  • To identify the specific effects of clozapine on different symptomatic dimensions of schizophrenia.

Main Methods:

  • An open-label study involving 51 patients meeting DSM-IV criteria for schizophrenia.
  • Utilized the Positive and Negative Symptom Scale (PANSS) and Extrapyramidal Symptoms Rating Scale (ESRS).

Main Results:

Related Experiment Videos

  • Clozapine demonstrated clinically significant efficacy on negative symptomatology.
  • Efficacy on negative symptoms was delayed compared to other symptom dimensions assessed by PANSS.
  • Significant efficacy on negative symptoms was also observed in nine patients identified as deficit patients.
  • Efficacy was not attributed to improved neurological tolerance as measured by ESRS.

    • Conclusions:

    • Clozapine is effective for negative symptoms in schizophrenia, even in deficit patients.
    • The therapeutic effect on negative symptoms is delayed but clinically significant.
    • Clozapine's efficacy is not solely due to better neurological tolerance.