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Botting, R. et al.

Modification by monoamine oxidase inhibitors of the analgesic, hypothermic and toxic actions of morphine and pethidine in mice.

A single injection of phenelzine 100 mg kg-1 given 18 h before, decreased the analgesia and hypothermia induced by morphine, but potentiated the analgesic and hypothermic effects of pethidine, when the analgesics were administered either intraperitoneally, or intracerebroventricularly. The modification of pethidine analgesia and hypothermia, but not morphine analgesia, was antagonized by methysergide (10 mg lg-1, s.c.). The LD50 of pethidine, but not that of morphine, was 30-40% lower in mice treated with phenelzine tranylcypromine or iproniazid 6 h before the test. The increased lethality of a single dose of pethidine induced by phenelzine was also prevented by methysergide. Pretreatment of mice with 100 mg kg-1 phenelzine was followed by a significant rise in both brain tryptophan and 5-hydroxytryptamine (5-HT) concentrations which lasted for 24 h. Therefore, the changes in pethidine effects could have been due to raised brain tryptophan and 5-HT concentrations.[1]

References

Modification by monoamine oxidase inhibitors of the analgesic, hypothermic and toxic actions of morphine and pethidine in mice. Botting, R., Bower, S., Eason, C.T., Hutson, P.H., Wells, L. J. Pharm. Pharmacol. (1978) [Pubmed]

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