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Tirat Carmel Mental Health Center, Tirat Carmel, Israel. poyurovs@tx.technion.ac.il
The noradrenergic (NE) system mediates cognitive dysfunction in schizophrenia patients, and the NE transporter represents a putative target for cognitive enhancing therapy. In a double-blind placebo-controlled study we evaluated the effect of add-on reboxetine (4 mg/day), a selective norepinephrine reuptake inhibitor (NRI), co-administered with atypical antipsychotic olanzapine (10 mg/day) on cognitive functioning in DSM-IV schizophrenia patients. The Automated Neuropsychological Assessment Metrics battery and Wisconsin Card Sorting Test were used to assess selective cognitive functions at baseline and endpoint (6 weeks). Clinical assessment was also performed. No between-group differences were found in neurocognitive tests, suggesting that reboxetine did not significantly change patients' cognitive performance compared to placebo. Reboxetine was well-tolerated and did not interfere with the therapeutic effect of olanzapine. Long-term studies using higher reboxetine dosages and alternative NRIs (e.g., atomoxetine) are needed to determine the role of NRIs as cognitive enhancers in patients with schizophrenia and other disorders associated with cognitive impairments.
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