A Study to Evaluate the Efficacy and of Stillen Tab. and to Demonstrate the Non-inferiority of Stillen Tab.

Inclusion Criteria: * Age is over 20 years old, under 75 years old, men or women * Patients diagnosed with acute or chronic gastritis by gastroscopy * Patients with one or more erosions found by gastroscopy * Signed the informed consent forms Exclusion Criteria: * Patients with peptic ulcer and gastroesophageal reflux disease * Patients administered with prokinetics, H2 receptor antagonists, proton pump inhibitors, anticholinergic drugs or non-steroid anti-inflammatory drugs prior to study in 2 weeks * Patients with surgery related to gastroesophageal * Patients with Zollinger-Ellison syndrome * Patients with any kind of malignant tumor * Patients administered with anti-thrombotic drugs * Patients with significant cardiovascular, pulmonary, heptic, renal, hemopoietic or endocrine system primary disease * Women either pregnant or breast feeding