The standard recipe for Bai Tong Tang is four sections of white onion, one epiphyllum, and one or two pieces of dried ginger. Bai Tong Tang is mainly composed of scallion white, dry ginger and epiphyllum. The efficacy of this formula is to break the yin and return yang, and to propagate the upper and lower parts of the body. It is mainly used in treating Shaoyin disease (a disease caused by the invasion of the Shaoyin meridian by an exogenous pathogen), in which the yin is in full bloom and the yang is floating in the upper part of the body, resulting in red cheeks and red cheeks. Clinical manifestations include diarrhea, coldness (fear of cold), lying down, cold hands and feet, red face like makeup, and weak pulse. In this formula, the Radix Pseudostellariae can restore yang and save reversal (by warming yang qi to save fainting, unconsciousness, etc.), Gan Ginger restores yang and passes through the veins, and the two together can warm the middle yang and communicate with the upper and lower parts of the body, while Shallot Bark can promote and pass through the yang qi. The combination of the two can warm the middle yang and communicate with the upper and lower levels, while scallion white can promote the passage of yang. The adverse reactions and contraindications of this drug are not clear. Patients who feel unwell are advised to consult a doctor in time and use the drug under the guidance of a physician.