[Direct action of timepidium bromide on the gastric mucosa and its inhibitory effect on pepsin secretion (author's transl)].

As quaternary ammonium compounds are generally not absorbed from gastric mucosa, the direct action of these compounds on the gastric mucosa can be investigated by means of intragastric (oral) administration to pylorus ligated animals. Effects of timepidium bromide (TB), an anti-cholinergic quaternary ammonium compound, on gastric secretion of pylorus ligated rats were investigated. When TB (100 mg/Kg) was administered orally, the secretion volume of gastric juice decreased slightly, while the concentrations of free acid and pepsin in gastric juice decreased remarkably. When TB was administered intraduodenally (100 mg/kg) or subcutaneously (10 mg/kg), secretion of gastric juice and free acid was strongly inhibited, but the pepsin concentration in gastric juice was not influenced (i.d.) or slightly increased (s.c.). In the oral administration of various drugs such as atropine, hyoscine-N-butylbromide and oxethazaine (Ox), only Ox caused a decrease in pepsin concentration in gastric juice. Similar effects of TB on the pepsin concentration in the gastric juice were also observed in experiments using stomach perfused rats. TB has no effect on enzymatic activity of pepsin in in vitro experiments. From these results, it is assumed that TB inhibits acid and pepsin secretion mainly by a direct action on the gastric mucosa.