Efficiency Study of S-Tenatoprazole-Na to Treat Erosive or Ulcerative Esophagitis

Inclusion Criteria: * Male or female outpatients aged 18 to 75 years inclusive * Symptomatic ulcerative or erosive esophagitis * Presence of heartburn (daytime and/or nighttime). * Understanding the study and agreeing to give a written informed consent * Able to communicate well with the investigator him(her)self or his/her representatives * Able and agreeing to comply with all study requirements Exclusion Criteria: * gastrointestinal bleeding * gastric or esophageal surgery * Zollinger-Ellison syndrome * primary esophageal motility disorders, * esophageal stricture, * inflammatory bowel disease, * upper gastrointestinal malignancy, * pancreatitis, * malabsorption * Barrett's esophagus (\> 3 cm) * Severe disease/condition such as malignancy * Hypersensitivity to PPIs