Abstract
46 Cases of gastric ulcer appearing to occur after drug administration (drug-induced gastric ulcer) were classified by endoscopic observation as follows : 1) Type exhibiting multiple small ulcers in the antrum. 2) Type exhibiting a single ulcer or a few ulcers in the angle and body. 3) The so called "trench ulcer" type. 4) Type resembling an ordinary chronic peptic ulcer. Drug-induced gastric ulcers demonstrate a different form and course depending upon whether the patients have a history of chronic gastric ulcer or not ; 1) In patients who had no history of chronic gastric ulcer, the ulcers appeared as 1) through 3) of our classification and healed within 2 months in most cases. 2) In patients who had a history of chronic gastric ulcer, the ulcers appeared as 4) of our classification. These ulcers had tendency to require long time until healing. Drugs inducing ulcers consist mainly of antipyretic-analgesis and some cnemotnerapeutics, anticoagurant and peripheral vasodilator on a few occasions.
