Chen Er Pill consists of Pericarpium Citri Tangerinae, Rhizoma Pinelliae, Poria and Radix Glycyrrhizae. Because Chen Er Pill is mainly made of dried tangerine peel and Pinellia ternate, and Chen Er Pill is best made of Pinellia ternate, it is called Chen Er Pill, which has the functions of eliminating dampness and resolving phlegm, regulating qi and regulating stomach. It is often used for cough, excessive phlegm and chest tightness caused by phlegm-dampness stagnation. Poria cocos has diuretic, spleen invigorating and tranquilizing effects, and can be used to treat anorexia caused by spleen deficiency and dampness excess. Glycyrrhiza uralensis Fisch is a good medicine for invigorating spleen and benefiting qi. Pericarpium Citri Tangerinae has the effects of resolving phlegm, regulating stomach, broadening chest and regulating qi, and is often used to treat symptoms such as excessive phlegm, cough, phlegm dampness and vomiting. Pinellia ternata can eliminate dampness and phlegm, and has the effects of reducing adverse reactions and stopping vomiting. Often used for phlegm drinking or vomiting caused by excessive cold phlegm. Several traditional Chinese medicines have the effects of eliminating dampness, resolving phlegm, regulating qi and regulating stomach.