Erchen decoction is mainly composed of processed Pinellia ternata, dried tangerine peel, Poria cocos and licorice, which has the functions of eliminating dampness and resolving phlegm, regulating qi and regulating middle energizer, and is mainly used for treating diseases such as phlegm-dampness stagnation and spleen-stomach disharmony. The diseases that conform to the application of Erchen decoction are called Erchen decoction syndrome. However, if Erchen decoction syndrome is complicated with other diseases, the types and dosage of drugs will be changed on the basis of Erchen decoction through syndrome differentiation. Because of the changes in medication and dosage, it is called adding and subtracting Erchen decoction. Every medicine has three kinds of toxicity, and any traditional Chinese medicine needs a doctor to eat through syndrome differentiation, otherwise it will be counterproductive. I wonder if I can help you.