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Time to clozapine response in a standardized trial
R R Conley1, W T Carpenter, C A Tamminga
1Maryland Psychiatric Research Center, University of Maryland School of Medicine, Baltimore, USA.
The American Journal of Psychiatry
|September 1, 1997
Summary
For treatment-refractory schizophrenia, clozapine response is typically seen within 8 weeks of a dose change. Prolonging clozapine treatment beyond 8 weeks at a stable dose offers little clinical benefit if no response is observed.
Area of Science:
- Psychiatry and Pharmacology
- Clinical Neuroscience
Background:
- Clozapine is an effective antipsychotic for treatment-refractory schizophrenia.
- Determining optimal treatment duration and dose escalation is crucial for patient outcomes.
Purpose of the Study:
- To ascertain the time required for clozapine response in patients with treatment-refractory schizophrenia.
- To evaluate the relationship between dose escalation and response onset.
Main Methods:
- A 12-month clozapine trial was conducted on 50 treatment-refractory schizophrenic inpatients.
- A standardized, increasing dose protocol was followed, with monthly Brief Psychiatric Rating Scale assessments.
- Response was defined by clinical criteria, and time to response was recorded.
Main Results:
- 68% of patients (34 out of 50) achieved a clinical response to clozapine.
- The mean time to response was 82 days, with most responders (88%) achieving response at doses of 600 mg/day or less.
- All responders demonstrated improvement within 8 weeks of a clozapine dose escalation.
Conclusions:
- Clozapine response in treatment-refractory schizophrenia is consistently observed within 8 weeks of a dose adjustment.
- Extending clozapine treatment duration beyond 8 weeks at a specific dose without response may not be clinically beneficial.