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The effects of the aqueous leaf extract of Combretum micranthum were studied on gastro intestinal smooth muscle of rodents. The extract was screened using isolated rabbit jejunum, guinea pig ileum and rat uterus. The extract produced relaxation of isolated rabbit jejunum and guinea pig ileum. The relaxation of guinea pig ileum was inhibited by phentolamine. The effect of the extract on rabbit jejunum and guinea pig ileum may involve adrenergic receptors. The extract had no effect on pregnant and non-pregnant isolated rat uterus. The result of preliminary phytochemical screening of the extract showed that, the aqueous leaf extract contains alkaloids, flavonoids, glycosides, saponins, tannins and phlabotannins. The properties of the extract may be due to the presence of these active constituents of pharmacological importance that bear relevance to its therapeutic claims in traditional medicine. Keywords : Combretum micranthum , Rabbit jejunum, Rat uterus and Guinea pig ileum.

Effect of aqueous leaf extract of <i>Combretum Micranthum</i> g. don (<i>Combretaceae</i>) on gastro intestinal smooth muscle.