• Neuroreport · Jul 1995

    Evidence of a central antinociceptive effect of paracetamol involving spinal 5HT3 receptors.

    • T Pelissier, A Alloui, C Paeile, and A Eschalier.
    • Equipe NPPUA, Laboratoire de Pharmacologie Médicale, Faculté de Médecine, Clermont-Ferrand, France.
    • Neuroreport. 1995 Jul 31;6(11):1546-8.

    AbstractThis study was carried out to determine both the effect of systemic paracetamol on the C-fibre evoked reflex activity, a test sensitive to centrally acting analgesic drugs, and the influence of an intrathecally administered 5HT3 receptor antagonist, tropisetron. Paracetamol (200, 300, 400 mg kg-1, i.v.) dose-dependently decreased (maximal effects -60 +/- 8%) the C-evoked responses for a duration of 90 min (for the lowest dose). This effect was totally suppressed by tropisetron (1 microgram, i.t.). These data confirm previous studies suggesting a central effect of this drug and demonstrate the involvement of a spinal 5HT3 mediated serotonergic mechanism.

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