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Introduction: Conscious rodent models are commonly used to assess the effects of new chemical entities on propulsion (transit) time in the gastrointestinal system. This study was designed to compare three compounds clinically known to cause constipative (morphine sulfate and propantheline bromide) and laxative (metoclopramide hydrochloride) effects on transit time in rats and mice and to note if there are differences between the species.

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