Flat Stomach San has the effects of drying dampness, transporting the spleen, moving qi and harmonizing the stomach (regulating the stomach and internal organs by promoting the operation of qi); while Er Chen Wan has the effects of drying dampness and resolving phlegm (removing phlegm in the body with dampness-drying medicines), regulating qi and harmonizing the stomach, and both of them have the effects of drying dampness, resolving phlegm, moving qi and harmonizing the stomach when used together. Ping Stomach San is one of the traditional Chinese medicine formulas, mainly composed of Rhizoma Atractylodis Macrocephalae, Rhizoma Atractylodis Macrocephalae, Pericarpium Citri Reticulatae and Radix Glycyrrhizae Praeparatae, with the effect of drying dampness and transporting the spleen, promoting the circulation of qi and harmonizing the stomach. The adverse reactions and contraindications of the drug are not clear. Er Chen Pills is a proprietary Chinese medicine, mainly composed of Semixia, Chen Pi, Poria, Radix et Rhizoma Glycyrrhizae and other Chinese herbs, which has the efficacy of drying dampness and resolving phlegm, regulating qi and harmonizing the stomach, and it can be used for the treatment of cough and phlegm due to phlegm-dampness stagnation, distension of the chest and epigastric region, and nausea and vomiting. The adverse effects of Er Chen Wan are not clear. It is not suitable for dry cough caused by lung yin deficiency. Avoid smoking, alcohol and spicy, cold and greasy food. It is not suitable to take tonic Chinese medicine at the same time during the medication. The use of drugs should be under the guidance of a physician to identify the evidence, do not recommend blindly taking Chinese medicine.