To Evaluate Efficacy and Safety of Z-215 in Erosive Esophagitis

Exclusion Criteria

• •Participants with a previous or current history of eosinophilic esophagitis,scleroderma, esophageal stenosis, esophageal varices, Barrett's esophagus ( columnar epithelium metaplasia\>=3 cm ) or high-grade dysplasia.However, participants with Schatzki's ring ( \>=20mm ) are allowed to be included.
• •Participants who have acute upper gastrointestinal bleeding, gastric or duodenal ulcer (mucosal defect with white coating\>=3mm) within 28 days prior to observation period . Participants with above disease at endoscopy during the observation period.
• •Participants with Zollinger-Ellison syndrome.Participants with suspected gastric acid hypersecretion disorders attributable to hyperparathyroidism and others.
• •Participants with a previous history of surgery of esophagus,stomach or duodenum (excluding removal of benign polyp by endoscopic polypectomy) .