Abstract
Noradrenaline (NA) plasma levels were examined in 18 healthy volunteers on 2 consecutive days after a single treatment with either lormetazepam (0.06 mg/kg) (LMZ group), flunitrazepam (0.03 mg/kg) (FNZ group) or placebo (PLA group) in combination with the benzodiazepine (BZ) antagonist Ro 15-1788 (0.1 mg/kg). Behavioural responses (mood changes, anxiety) were also investigated in parallel. Both BZ decreased NA plasma levels to 50% of the basal values 10 min after the injection; administration of Ro 15-1788 15 min later reinstated NA plasma levels to basal values. A second administration of Ro 15-1788 (0.1 mg/kg) 24 h after BZ or PLA treatment increased NA plasma levels, estimated 10 min after the injection in both the LMZ- and the FNZ groups, but not in the PLA group. Behavioural responses measured under the same treatment also indicated minor anxiety responses followed by mood impairment. These data suggest that a stressful situation may be precipitated by the antagonist Ro 15-1788 24 h after a single BZ treatment, which resembles a withdrawal response, and increases NA plasma levels.
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Duka, T., Ackenheil, M., Noderer, J. et al. Changes in noradrenaline plasma levels and behavioural responses induced by benzodiazepine agonists with the benzodiazepine antagonist Ro 15-1788. Psychopharmacology 90, 351–357 (1986). https://doi.org/10.1007/BF00179190
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DOI: https://doi.org/10.1007/BF00179190