10-[1-aza-(2,2,2)-bicyclo-3-octyl]-10H-2-phenothiazinesulfonamides of the formula: IMAGE (I) wherein R represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms are disclosed together with a process for their preparation. These compounds can be used as medicaments for the treatment of duodenal and gastric ulcers.
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