Er Chen Wan belongs to the category of expectorants, with the effects of drying dampness and resolving phlegm (expelling dampness by drying dampness and resolving phlegm), regulating qi and harmonizing the stomach. If children have phlegm-dampness in their body, they can take it under doctor’s guidance, not by themselves. In the formula of Er Chen Pill, Semixia and Chen Pi dry dampness and resolve phlegm, regulate qi and harmonize the stomach, Poria strengthens the spleen and seeps away dampness, ginger resolves phlegm and stops vomiting, and Glycyrrhiza strengthens the spleen and harmonizes the middle, and the above herbs are often used in the treatment of coughing and phlegm, chest tightness and abdominal distension, nausea and vomiting. This product is pungent and dry, and should not be used by people with dry cough and little phlegm, or dry mouth, throat and skin. Note that the dosage for children is different from that for adults, and it is recommended that pediatricians guide the use of the drug after consultation. Clinical use of medication should be guided by identification of evidence, it is recommended to use medication under the guidance of a professional physician, do not take on their own.