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  • Title: Anxiogenic effects of m-CPP in patients with panic disorder: comparison to caffeine's anxiogenic effects.
    Author: Klein E, Zohar J, Geraci MF, Murphy DL, Uhde TW.
    Journal: Biol Psychiatry; 1991 Nov 15; 30(10):973-84. PubMed ID: 1756202.
    Abstract:
    The behavioral and neuroendocrine effects of meta-chlorophenylpiperazine (m-CPP), a serotonergic agonist, were compared with the effects of caffeine, an adenosine antagonist, in panic disorder patients. Patients with panic disorder were given single oral doses of 0.5 mg/kg m-CPP, 480 mg caffeine, and placebo on separate days under double-blind conditions. Both m-CPP and caffeine had significantly greater anxiogenic and panic-inducing effects than placebo, although caffeine produced nonsignificantly greater increases on all anxiety rating scales than m-CPP. Both m-CPP and caffeine produced significant equivalent increases in plasma cortisol concentrations, but only m-CPP produced plasma prolactin increases. These findings provide further evidence implicating both the serotonergic and adenosinergic receptor systems in the neurobiology of panic disorder.
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