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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Synergistic effects of tandospirone and selective serotonin reuptake inhibitors on the contextual conditioned fear stress response in rats.
European Neuropsychopharmacology : the Journal of the European College of Neuropsychopharmacology 2007 October
The purpose of this study was to investigate the effects of co-administration of tandospirone (a 5-HT(1A) receptor agonist) and individual selective serotonin reuptake inhibitors (SSRIs) on the contextual conditioned fear stress, using an anxiety model in rats. One day after fear conditioning, tandospirone (0.3-3 mg/kg, s.c.), paroxetine (5-20 mg/kg, i.p.), fluvoxamine (30-60 mg/kg, i.p.) and citalopram (3-30 mg/kg, i.p.) significantly inhibited the conditioned freezing in a dose-dependent manner, whereas, 14 days after fear conditioning, the anxiolytic effects of these drugs were weakened. Fourteen days after fear conditioning, co-administration of tandospirone (0.3 mg/kg, s.c.) with each SSRI [paroxetine (5 mg/kg, i.p.), fluvoxamine (30 mg/kg, i.p.) and citalopram (10 mg/kg, i.p.)], given at subeffective doses, markedly inhibited the conditioned freezing without affecting the locomotor activities and CYP3A4-related pharmacokinetic drug-drug interaction. These results elucidate the pharmacodynamic synergistic effects of tandospirone and SSRIs. Therefore, this augmentation therapy (SSRI+5-HT(1A) receptor agonist) may prove useful for some anxiety disorders.
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