Avoid or use cautiously Chai Hu for those with yin deficiency and hyperactivity of yang (deficiency of yin fluid and hyperactivity of yang), internal movement of liver wind, yin deficiency and hyperactivity of fire (deficiency of yin essence in the body and hyperactivity of deficiency fire), and those with reversal of qi upward. The efficacy of Chai Hu is to relieve exterior fever, elevate yang qi, and relieve liver depression (treating depression by unblocking liver qi). It is mainly used in treating colds and fever, cold and heat (the body is hot and cold at the same time), distension and pain in the chest and ribs, prolapse of the uterus, prolapse of the anus, and menstrual disorders. As Chai Hu is a radical that disperses and depletes liver yin, it is contraindicated or used with caution in those with yin deficiency and hyperactivity of yang, those with internal movement of liver wind, those with yin deficiency and fire, and those with reversal of qi energy. Contraindications of Chinese and western medicines: Chaihu contains quercetin, and should not be used with western medicines containing various metal ions, such as aluminum hydroxide preparations, calcium preparations, ferrous preparations, etc., which can form a complex and affect the absorption; Vitamin C can decompose the glycosides of Chaihu into glycosides and sugar, thus affecting the therapeutic efficacy, and thus it is not suitable for the use of the same medicine. The adverse effects of Chaihu are not clear. If you need to use the drug, must be taken under the guidance of a doctor in a regular hospital, do not blindly self-medication.