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This is a parallel-group, placebo-controlled trial examining the cognitive effects at weeks 1, 4, & 8 of once-weekly oral D-cycloserine 50 mg added to a stable dose of antipsychotic for 8 weeks in adult outpatients with schizophrenia.
In a previous placebo-controlled trial, we demonstrated significant improvement of negative symptoms with once-weekly D-cycloserine treatment. In addition, we found significant improvement of memory consolidation following the first dose; however, the effect on memory consolidation was lost after several weeks. The "practice effect" of weekly measurement of memory consolidation using repeated administration of the Logical Memory Test may have resulted in a "ceiling effect" which would obscure drug/placebo differences. In the current study, we propose to administer the Logical Memory Test at four-week intervals (weeks 1, 4 and 8) to avoid the ceiling effect. We will also add a measurement of negative symptoms at week 4 to better characterize the time course of negative symptom improvement.
1. Assess the effects of a single dose of D-cycloserine 50 mg on memory consolidation as measured by the Logical Memory Test compared to placebo.
2. Assess the persistence of once-weekly D-cycloserine effects on memory consolidation measured at weeks 4 & 8.
3. Assess the effects of repeated weekly dosing of D-cycloserine on performance on a standard cognitive battery at week 8 compared to placebo.
4. Assess effects of weekly D-cycloserine dosing on negative symptoms at weeks 4 & 8 compared to placebo.
5. Assess tolerability and side effects of weekly D-cycloserine compared to placebo.
Allocation: Randomized, Control: Placebo Control, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor), Primary Purpose: Treatment
Massachusetts General Hospital
National Institute of Mental Health (NIMH)
Published on BioPortfolio: 2014-07-24T14:11:46-0400
This study seeks to examine the effects of D-cycloserine augmentation on cognitive remediation for patients diagnosed with schizophrenia. We will test the hypotheses that D-cycloserine wi...
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Antibiotic substance produced by Streptomyces garyphalus.
An obsolete concept, historically used for childhood mental disorders thought to be a form of schizophrenia.
Misunderstanding among individuals, frequently research subjects, of scientific methods such as randomization and placebo controls.
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