The extracts of Yukgunja-tang which has been used in some of gastroin testinal disorders were examined for secretion of gastric juice and movement of isolated stomach of rabbit. Experiments were performed with the dried extract of Yukgunja-tang (sample I) and the dried extract compound made of each drug of Yukgunja-tang (sample II). The secretion of gastric juice at the doses of 25.0 and 50.0mg/kg p.o. of sample I showed the decreases of 34.3 and 43.3%, respectively, as compared with control group, whereas the secretion at a dose of 76.8g/kg of sample II showed 43.1%. In gastric acid secretion, sample I showed 50.0% decrease at a dose of 50.0mg/kg and sample II showed 46.2% decrease at a dose of 76.8mg/kg. In pepsin output sample I showed 17.8 and 23.4% decreases at a dose of 25.0 and 50.0mg/kg, respectively, whereas sample II showed 22.5% decrease at a dose of 76.8mg/kg. The isolated stomach of rabbit showed dose-responsive contraction by addition of sample I, however the contraction was not observed by sample II.
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