Poria cocos has the nature of fluent, usually pregnant women can not take. Poria cocos is the dried rhizome of Sarsaparilla glabra, family Liliaceae. The drug is sweet, light and flat in nature, belonging to the liver and stomach meridian, with the effect of detoxification, dehumidification, and fluent joints. It can be used in the treatment of syphilis and mercury poisoning caused by limb constriction, tendon and bone pain, damp-heat gonorrhea, leucorrhoea, carbuncle, scrofula (mainly refers to cervical lymph node tuberculosis), scabies and other conditions. When used, Tu Fu Ling should be noted that it should not be used by patients with liver and kidney yin deficiency (insufficient yin fluid in the liver and kidneys). It is not suitable for pregnant women because of its fluxing properties. If necessary, it is recommended to go to a regular hospital for consultation and treatment under the guidance of a professional physician for evidence-based treatment, and should not be taken on its own to avoid adverse consequences.