To Evaluate the Efficacy and Safety of DW1903 in Acute and Chronic Gastritis Patient

Inclusion Criteria: * Patients who were diagnosed with acute or chronic gastritis in a gastroscopy performed within 7 days prior to administration of this trial. * At least one or more erosions have been identified on gastroscopy. * Patients who decided to voluntarily participate in this trial and agreed in writing. Exclusion Criteria: * Patients who can not undergo gastroscopy * Peptic ulcer (except scarring) and reflux esophagitis * Patients who have had gastric acid suppression surgery or stomach/esophagus surgery (except for simple perforation surgery and appendectomy) * Patients with a history of gastrointestinal malignancies * Zollinger-Ellison syndrome patients * Patient with spontaneous coagulation disorder * Patients with an allergic or hypersensitive response to a study drug * Patients with a potential pregnancy. * Patients who had clinically significant abnormalities in the screening test. * Pregnant and lactating women * Those currently taking other study drugs * patients who were judged to be ineligible for the trial by the principle investigator and the person in charge.