The side effects and dangers of calamus on the liver are not known. Acorus calamus is the dried rhizome of Acorus calamus in the family of Tennessee. It is pungent, bitter and warm in nature. It belongs to heart and stomach meridian. It has the efficacy of opening the orifices and expelling phlegm, awakening the mind and benefiting the intellect, resolving dampness and opening up the stomach (normalizing gastrointestinal function by removing dampness). It is used in epilepsy, forgetfulness and insomnia, tinnitus and deafness, epigastric plumpness and lack of hunger, silencing dysentery. Calamus is warm, where the external wind-cold or warm heat, heat within the blazing, yin deficiency fire (Yin essence deficiency in the body, the emergence of deficiency fire hyperactivity), blood deficiency blood heat, etc., avoid taking a single flavor; pungent dry and scattered, there is harm to the disadvantages of fluid depletion, yin and blood deficiency, should not be used. It is recommended to use the drug under the guidance of a doctor.