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  • Title: Chronic administration of clomipramine inhibits morphine hot plate analgesia.
    Author: Fialip J, Makambila MC, Rigal F, Devoize JL, Varoquaux O, Eschalier A.
    Journal: Life Sci; 1986 Mar 24; 38(12):1097-103. PubMed ID: 3959744.
    Abstract:
    Clomipramine, chronically administered in mice, for 3 days, inhibits partially but significantly morphine analgesia in the hot plate test, when used at dose of 10 mg/kg/day, i.p.; 2.5 and 5 mg/kg/day were ineffective. Neither higher doses (20 and 40 mg/kg/day) nor longer duration of pretreatment (8 and 16 days) modified the intensity of this inhibition. Reduction in morphine analgesia was obtained after a 24h delay between the last injection of clomipramine and that of morphine (30 min before testing), while clomipramine did not induce any antinociceptive effect and clomipramine and desmethylclomipramine plasma and brain levels were low or undetectable. These results provide new evidence for the interaction between clomipramine and the endogenous opiate system. A pharmacokinetic interaction between clomipramine and morphine was excluded; involvement of change in opiate and 5 HT2 receptors by chronic administration of clomipramine is discussed.
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