Background: Patients with schizophrenia often suffer from cognitive deficits and negative symptoms that are poorly responsive to antipsychotics including clozapine. Clozapine-induced sedation can worsen cognition and impair social and occupational functioning.
Objectives: To evaluate the efficacy, tolerability, and safety of modafinil for negative symptoms, cognition, and wakefulness/fatigue in DSM-IV-diagnosed schizophrenia patients treated with clozapine.
Method: A double-blind, placebo-controlled, flexible-dosed 8-week pilot trial was conducted between September 2003 and September 2007, adding modafinil up to 300 mg/d to stabilized schizophrenia outpatients receiving clozapine. Psychopathology, cognition, and wakefulness/fatigue were assessed with standard rating scales.
Results: Thirty-five patients were randomly assigned to treatment with study drug and included in the analysis. Modafinil did not reduce negative symptoms or wakefulness/fatigue or improve cognition compared to placebo. Modafinil was well tolerated and did not worsen psychosis.
Conclusions: Results of this pilot trial do not support routine use of modafinil to treat negative symptoms, cognitive deficits, or wakefulness/fatigue in patients on clozapine. However, given our limited power to detect a treatment effect and the clear possibility of a type II error, larger trials are needed to resolve or refute a potential therapeutic effect of uncertain magnitude.
Trial Registration: clinicaltrials.gov Identifier: NCT00573417.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5038350 | PMC |
| http://dx.doi.org/10.4088/JCP.08m04683 | DOI Listing |
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