Abstract
The influence of methergoline, methysergide, mianserine, cyproheptadine, and pizotifen on catalepsy induced by morphine, codeine, and fentanyl, and antinociception induced by these three drugs and by pentazocine was studied in rats. Methergoline dose-dependently reduced catalepsy induced by these three drugs. Methysergide abolished only morphine catalepsy, while mianserine significantly reduced the effect of morphine and codeine. Cyproheptadine and pizotifen did not modify the cataleptic effect of the three analgesics used. Antinociceptive action of morphine, codeine, fentanyl, and pentazocine, measured by the hot plate method, was not influenced or changed differentially by any serotonin receptor blocking compounds. One may conclude that catalepsy induced by morphine is, in general, antagonized by serotonin receptor blockade, but this does not concern all narcotic analgesics. In the antinociceptive effects of drugs used, the serotonergic influence seems to play a less important role than in catalepsy.
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Malec, D., Langwiński, R. The influence of 5-HT receptor blocking agents on the behavioral effects of analgesics in rats. Psychopharmacology 69, 79–83 (1980). https://doi.org/10.1007/BF00426526
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DOI: https://doi.org/10.1007/BF00426526