Sankyo Company, Limited

Mitsuko Makino

Sadao Ishihara

Keiichi Tabata

Shigeki Miyake

A method for the treatment or prevention of an ulcerative disease comprising administering to a patient an effective amount of an active compound in admixture with a pharmacologically acceptable carrier or diluent, wherein said active compound is a thia-or oxazolidinone compound of the following formula or a pharmacologically acceptable salt thereof: ##STR1## wherein W is sulfur or oxygen and X is --N(R.sup.3)--, or X is sulfur or oxygen and W is --N(R.sup.3)--; R.sup.3 is hydrogen, C.sub.1 -C.sub.6 alkyl or aralkyl; R.sup.4 and R.sup.5 are the same or different and each is hydrogen, C.sub.1 -C.sub.6 alkyl,aralkyl, aryl, 5- or 6-membered aromatic heterocyclic; R.sup.6 is hydrogen, C.sub.1 -C.sub.6 alkyl or aralkyl; and A is C.sub.2 -C.sub.6 alkylene.

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Tokyo, Japan

Mitsuko Makino