Because of the ascending and dispersing nature of Chai Hu in Xiao Chai Hu Tang and the dry nature of Scutellaria Baicalensis and Semixia, it is contraindicated for those with Yin deficiency and blood deficiency. Xiao Chai Hu Tang is a Chinese herbal formula composed of Chai Hu, Scutellaria baicalensis, Radix et Rhizoma Ginseng, Radix et Rhizoma Pinelliae, Radix et Rhizoma Glycyrrhizae, Radix et Rhizoma Ginger and Fructus Jujubae, which is effective in relieving Shaoyang (treating exogenous heat illnesses in which the evil is in the half-expression and half-li). This formula is clinically used in treating diseases of cold and heat to and fro, bitter fullness in the chest and hypochondriacs (feeling distended and uncomfortable at the front and sides of the chest), silent disinterest in food and drink, disturbed and nauseous, bitter mouth, dry throat, dizziness, women’s apoplexy, heat entering into the blood compartment, menstruation fitness and interruption of menstruation, and cold and heat attacks at times, and can also be used in malaria and jaundice when Shaoyang syndrome is seen. This product is prohibited for those who have a deficiency of Yin and blood, when using Xiao Chaihu Tang to treat diseases, go to a regular medical institution and take it under the guidance of a doctor after a prescription is issued by a professional Chinese medicine practitioner.