There is no so-called miraculous effect of Er Chen Pills, and this claim is exaggerated. In fact, it has the effect of drying dampness and resolving phlegm (removing phlegm in the body with dampness-drying drugs), regulating qi and harmonizing the stomach. Er Chen Pills is a Chinese patent medicine, composed of Pinellia, Poria and Glycyrrhiza, in which Pinellia has the efficacy of being bitter, warm and dry, drying dampness and resolving phlegm, strengthening the spleen and stomach (restoring the functions of the spleen and stomach), lowering the rebelliousness and stopping vomiting (preventing the upward rush of gastric qi and stopping the vomiting); Poria has the efficacy of strengthening the spleen and seeping away the dampness; and Glycyrrhiza has the efficacy of replenishing the spleen and neutralizing the middle, and adjusting the medicines (adjusting the properties of different traditional Chinese medicines); the effects of drying dampness and removing phlegm and regulating qi and harmonizing the stomach are achieved by the multiple effects together. Er Chen Wan is mainly used for cough, distension of the epigastric region, nausea and vomiting caused by phlegm-dampness obstruction. The adverse effects and contraindications of Er Chen Pills are not clear at present. Precautions, avoid smoking, alcohol and spicy and greasy food; lung yin deficiency caused by dry cough contraindicated; during the medication, if the patient’s body temperature exceeds 38.5 ℃, or the symptoms have not improved, should go to the hospital in a timely manner. If you need to use the drug is recommended to be used under the guidance of a traditional Chinese medicine practitioner, unauthorized use of drugs may cause adverse consequences.