Objective : A gastroesophageal reflux of contrast medium was useful in diagnosing reflux esophagitis radiologically. The aim of this study was to investigate the prevalence of reflux esophagitis caused by Ca antagonists in elderly subjects. Participants : Three hundred sixty-one adults and 190 elderly subjects were investigated. Of those, 31 adults and 45 elderly subjects receiving a Ca antagonist were studied. Methods : A gastroesophageal reflux was used to obtain a double contrast figure in the supine position and a filling figure in the prone position radiologically. Reflux esophagitis was evaluated by the Los Angeles classification by endoscopy. Results : The prevalence of reflux esophagitis was 12.2% in adults and 17.9% in the elderly. The incidence of reflux esophagitis was 35.1% in adults and 42.2% in the elderly receiving the Ca antagonist. Conclusions : Our studies extended this relationship between Ca antagonist administration and reflux esophagitis, especially among the elderly. The administration of a Ca antagonist in the elderly should be borne in mind as a cause of reflux esophagitis.