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Dose-finding trial of D-cycloserine added to neuroleptics for negative symptoms in schizophrenia
Am J Psychiatry 1995;152:1213-1215.
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Abstract

OBJECTIVE: The authors conducted a dose-finding study of D-cycloserine, a partial agonist at the glycine site of the N-methyl-D-aspartate subtype of the glutamate receptor, added to conventional neuroleptics for schizophrenic patients with prominent negative symptoms. METHOD: Nine patients with schizophrenia completed consecutive 2-week trials of placebo and four doses of D-cycloserine. Clinical assessments were videotaped and were scored by a rater who was blind to temporal sequence. RESULTS: D-Cycloserine at a dose of 50 mg/day produced a significant reduction (mean = 21%, SD = 28%) in negative symptoms and significantly improved reaction time as measured by Sternberg's Item Recognition Paradigm, a test mediated in part by prefrontal cortex. CONCLUSIONS: This preliminary evidence suggests that D-cycloserine may improve negative symptoms and cognitive deficits over a narrow dose range when added to conventional antipsychotic agents.

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