Phenoxypropylamine derivatives of the general formula ##STR1## wherein R.sub.1 represents a hydrogen atom or a methyl or ethyl group, R.sub.2 and R.sub.3, independently from each other, represent a lower alkyl group, or together form a linear alkylene group having 4 to 7 carbon atoms which may be optionally substituted by a hydroxyl or hydroxymethyl group, and R.sub.4 represents a hydrogen atom or a group of the formula --R.sub.5 --Z in which R.sub.5 represents a lower alkylene group, and Z represents a hydrogen atom or an amino, mono- or di-(lower alkyl)-amino, hydrdoxy lower alkylamino, lower alkanoylamino, hydroxyl, lower alkoxy, lower alkanoyloxy, phenoxy, halophenoxy, benzoyloxy or halobenzoyloxy group, andthe salts thereof; to a process for production thereof; and to their medicinal use, particularly to antiulcer agents comprising these phenoxypropylamine derivatives or their salts.