Er Chen Wan is suitable for patients with symptoms such as cough and phlegm, nausea and vomiting, chest and epigastric distension caused by phlegm-dampness stagnation. Er Chen Pills is composed of Semixia, Pericarpium Citri Reticulatae, Poria and other traditional Chinese medicines. Semixia can dry dampness and resolve phlegm (use dampness-drying medicines to dispel phlegm in the body), Pericarpium Citri Reticulatae can regulate qi and strengthen the spleen (regulate qi and strengthen the spleen), and dry dampness and resolve phlegm, so Er Chen Pills can dry dampness and resolve phlegm, regulate qi and harmonize the stomach, and are effective in treating the symptoms such as cough and phlegm caused by phlegm-dampness stagnation, nausea, vomiting and distension and stuffiness of chest and epigastric region. The adverse effects and contraindications of this drug are not clear, but spicy and greasy food should be prohibited during the period of taking the drug. The use of proprietary Chinese medicines is recommended under the guidance of a doctor, and should not be taken on its own, so as to avoid the occurrence of medicines that are not suitable for the symptoms and other situations, which will lead to a misunderstanding of the condition.