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With oral and intravenous doses of metoclopramide there was no constant effect on the gastric emptying of test meals of glucose or sodium citrate, nor was secretion of acid by the stomach in response to test meals of glucose or sodium citrate affected. Apomorphine, in subnauseous doses (0.25 mg intravenously) slowed the gastric emptying of test meals containing sodium citrate, and 10 mg of intravenous metoclopramide abolished the slowing of gastric emptying caused by apomorphine.
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Ramsbottom et al. (1970) studied this question.
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