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  • Title: Does metergoline selectively attenuate 5-HT mediated prolactin release?
    Author: Ellis PM, Gartside SE, Ware CJ, Campling GM, Cowen PJ.
    Journal: Psychopharmacology (Berl); 1991; 105(1):129-31. PubMed ID: 1745704.
    Abstract:
    Administration of the non-selective 5-HT receptor antagonist metergoline (0.5 mg/kg) to male rats attenuated the prolactin response to the 5-HT releasing agent d-fenfluramine (7.5 mg/kg) but not to the dopamine receptor antagonist haloperidol (1.5 mg/kg). In contrast, in healthy male volunteers, pretreatment with metergoline (4 mg orally) abolished the prolactin response to intravenous haloperidol (5 micrograms/kg). The findings suggest that in humans blockade of a prolactin response by a conventional oral dose of metergoline cannot be taken as evidence of involvement of 5-HT-mediated mechanisms.
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