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The effects of GR38032F a novel, selective and potent 5-hydroxytryptamine (5-HT3)-receptor antagonist on gastric emptying in the guinea-pig were investigated and compared to those of metoclopramide and haloperidol. Both GR38032F and metoclopramide increased gastric emptying in a dose-dependent manner. In contrast, haloperidol was ineffective. GR38032F was about 200 times more potent than metoclopramide in enhancing gastric emptying over the 2 h period studied.
Costall et al. (Mon,) studied this question.