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The effect of the selective 5-hydroxytryptamine (5-HT-1A) receptor agonist 8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT) on nociception and morphine analgesia was tested with the tail-flick method in mice. 8-OH-DPAT (0.06-1.0 mg/kg) had no apparent effect on the general behavior of the animals and did not change their reactivity to stimulation with noxious radiant heat. The compound did, however, dose-dependently attenuate the antinociception induced by administration of morphine hydrochloride (5.0 and 10.0 mg/kg). Thus, stimulation of a subpopulation of serotonin receptors may counteract the antinociceptive effect of morphine in the tail-flick test.
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