According to Compendium of Materia Medica, dried tangerine peel has three functions, one is to guide cold evil in the chest, the other is to break qi stagnation, and the third is to benefit the spleen and stomach. The longer the dried tangerine peel is stored, the stronger the efficacy. Pericarpium Citri Tangerinae has the functions of regulating qi, lowering adverse qi, regulating middle energizer, stimulating appetite, eliminating dampness and resolving phlegm. Mainly used for spleen and stomach qi stagnation and dampness resistance, chest and diaphragm fullness, abdominal distension, anorexia, vomiting, unfavorable stool, poor lung qi, cough with excessive phlegm, and can also be used for the treatment of early breast abscess.

Pericarpium Citri Tangerinae has the functions of regulating qi, invigorating spleen, eliminating dampness and resolving phlegm, and returning spleen and lung meridians. Clinically, it is used to treat spleen and stomach qi stagnation syndrome, mainly for promoting qi circulation to relieve pain, invigorating spleen and regulating middle energizer, and also for treating vomiting and hiccup. It is often combined with ginger, bamboo shavings and other herbs, and can also be used to treat wet phlegm and cold phlegm cough. Therefore, dried tangerine peel is the main medicine for treating phlegm-dampness cough, and Pinellia ternata is often used in combination, such as Erchen Decoction. It can also be used for treating thoracic obstruction, thoracic obstruction and shortness of breath. Often used with Fructus Aurantii Immaturus and ginger. The above popular science knowledge is for reference only.