The medicines used to clear the source of Yin in Dazhongyin Wan are Huangbai and Zhimu. Dazhongyin Wan is a traditional Chinese medicine formula from Danxi Xinfa, which is effective in nourishing yin and lowering fire (nourishing the yin essence and lowering the fire). It is used in treating yin deficiency and fire exuberance, and is able to improve conditions such as bone vaporization and damp-heat (a burst of heat, feeling that the heat is penetrating from inside the bones to the outside), night sweating (abnormal sweating after going to sleep, but stopping after waking up), spermatorrhea, and cough and hematemesis. This formula is composed of ripened dihuang, tortoise board, cypress, Zhimu, etc., in which cypress is bitter cold and diarrhea phase fire to firm yin; Zhimu is bitter cold and moist, can clear and moisten the lung gold, and can nourish and clear the kidney water, and cypress is necessary to use, bitter cold and fire, preserve yin fluid, and suppress hyperactivity of yang, which is the drug used to clear the source of the Dai Tonic Yin Pill, and it is effective in cultivating and clearing the source of the yin. The adverse reactions and contraindications of Dahuanyin Pills have not been clarified, and should not be taken by patients with cold and fever. If you need to take Dajianyin Pills, you should go to the local regular hospital, under the guidance of the doctor to use drugs, avoid self-medication, so as not to delay the condition.