Herbal medicines (Eunkyosan and Samsoeum) for treating the common cold: a protocol for a randomized, placebo-controlled, multicenter clinical trial

The common cold is the most frequent acute respiratory illness that places a burden on society, both personally and economically. There is no standard therapy; only symptomatic therapy remains the mainstay of common cold treatment. Thus, interest in herbal medicines is on the rise. Eunkyosan and Samsoeum are used for the common cold in East Asian countries. Although Eunkyosan and Samsoeum are clinically used for the treatment of the common cold,...