Dried roots of Platycodongrandiflorus (Jacq.) A.Dc. Dig and wash in spring and autumn, remove the roots, peel off the outer skin while fresh or leave it on, and dry. Born on mountain grassy slopes, forest edges, or cultivated. Distributed in various regions of the country. It has the effects of promoting lung function, clearing throat, eliminating phlegm, and expelling pus. Used for coughing with excessive phlegm, chest tightness, sore throat, hoarse voice, and vomiting pus from lung abscess.