Study to Evaluate the Efficacy and Safety of DWP14012 in Patients With Acute or Chronic Gastritis

Inclusion Criteria: * Adults between 19 and 75 years old based on the date of written agreement * Those who are diagnosed with acute or chronic gastritis with at least one erosion observed on upper gastrointestinal endoscopy * Those who had experienced one or more subjective symptoms of gastritis Exclusion Criteria: * Those who have had surgery to reduce gastric acid secretion, or gastric or esophageal surgery * Those with history of clinically significant hepatic, renal, neurologic, pulmonary, endocrine, hematologic, cardiovascular or genitourinary disease that could affect the study results