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Background/Aims: DW1601, an oral fixed dose combination syrup composed of DW16011 and Pelargonium sidoides, was developed to enhance the symptom relief effect in patients with acute bronchitis. We evaluated the efficacy and safety of DW1601 compared to DW16011 or P. sidoides for treatment of acute bronchitis using a randomized, double-blind, placebocontrolled, multi-centre trial design. Methods: A total of 204 patients with acute bronchitis was randomized 1:1:1 to receive DW1601 (n = 67), DW16011 (n = 70), or P. sidoides (n = 64) for 7 days. The primary outcome was efficacy of DW1601 compared to DW16011 or P. sidoides in reducing the total bronchitis severity score (BSS) at day 4 of treatment. Secondary endpoints were changes in total and symptomspecific BSS, response rate and patient satisfaction rate. Safety analysis was assessed at day 7. Results: At 4 days after medication, decrease of total BSS from baseline was significantly greater in the DW1601 group than in the DW16011 group (–3.51 ± 0.18 vs. –2.65 ± 0.18, p = 0.001) or P. sidoides group (–3.56 ± 0.18 vs. –2.64 ± 0.19, p < 0.001). In addition, the BSS total score at day 7 and the BSS cough and sputum component scores at days 4 and 7 were significantly more improved with DW1601 treatment compared with the DW16011 group or P. sidoides group. Participants treated with DW1601 showed higher rates of response and satisfaction than control groups (response rate, DW1601, 100% vs. DW16011, 85.7% vs. P. sidoides, 85.9%; satisfaction rate, DW1601, 92.6% vs. DW16011, 82.9% vs. P. sidoides, 81.2%). Significant adverse events were not observed in the DW1601 group. Conclusions: DW1601 is superior to DW16011 or P. sidoides in improving symptoms of acute bronchitis.
