Overview Study Regarding the Clinical Efficacy of Synatura® in Patients With Chronic Bronchitis Type COPD Status: Completed Trial end date: 2018-05-02 Target enrollment: Participant gender: Summary This study aims to examine the clinical efficacy of synatura in patients with chronic bronchitis type COPD in Korea. Phase: Phase 4 Details Lead Sponsor: Ahn-Gook Pharmaceuticals Co.,Ltd