Oyster San is a traditional Chinese medicine formula with the efficacy of astringing yin and stopping sweating (astringing yin fluid to reduce sweating), benefiting qi and consolidating the surface of the body, treating spontaneous sweating (involuntary sweating during the daytime, aggravated by sweating with a little movement), night sweating (abnormal sweating after going to sleep, but sweating stops after waking up), etc. It is mainly composed of oyster, astragalus, ephedra root and other Chinese medicines. Oyster San is from “Taiping Huimin Hejie Bufang”, which is mainly composed of oyster, astragalus, ephedra root and other herbs, so it has the effect of astringing yin and stopping sweating, benefiting qi and consolidating the surface, and is mainly used in treating spontaneous sweating and night sweating. Symptoms include spontaneous sweating, night sweating, especially at night for a long time, palpitation and alarm, shortness of breath and tiredness, etc. This formula is an ancient Chinese medicine prescription. This formula is a traditional Chinese medicine formula, the specific selection should also be based on the patient’s own specific symptoms in the physician under the guidance of the diagnosis of addition, subtraction and customization of the use of drugs, do not self-medication, so as not to cause damage to the organism.