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Effects of timepidium bromide (TB) on the motility of various smooth muscles and the secretion of digestive juice were examined and the activity was compared with those of hyoscine-N-butylbromide (HB) and atropine sulfate (Atr). In dogs, TB inhibited the spontaneous and bethanechol-induced motility of various regions of the gastrointestinal tract, the activity being almost the same as that of Atr but stronger than that of HB. All these drugs exhibited a similar inhibitory effect on the motility of the gallbladder. On the contrary, the inhbitory effect of TB on the spontaneous motion of urinary bladder was somewhat weaker than those of HB and Atr, while this effect on the bethanechol-induced motility was nearly equal the effects of HB and Atr. It was also evident that TB inhibited the gastric acid secretion induced by bethanechol: the activity was stronger than that of HB, while it was weaker than that of Atr. Similar effects on the gastric acid secretion were also found in rats. In the case of salivary secretion, however, TB and HB produced much weaker inhibitory actions than Atr. TB even at a higher dose produced little significant effect on the pancreatic and biliary secretion of rats. The uterine contraction induced by methacholine was inhibited by all these drugs. The mydriatic activity of TB in mice was found to be the weakest among the drugs tested.

Pharmacological actions of timepidium bromide on the motility of visceral smooth muscles and the secretion of digestive juice in experimental animals