Calamus in water has the effect of opening the orifices and removing phlegm, awakening the mind and promoting wisdom, resolving dampness and opening the stomach (normalizing gastrointestinal function by removing dampness). Acorus calamus is the dried rhizome of Acorus calamus in the family of Acorus calamus, which has the effects of opening the orifices and removing phlegm, awakening the mind and wisdom, and resolving dampness and opening the stomach. The drug is mainly used for the treatment of epigastric (abdominal) plumpness (stomach distension and discomfort) caused by dampness obstructing the middle jiao (dampness obstructing the functions of the spleen and stomach); delirium caused by phlegm obscuring the orifices of the clear orifices; and also used for the treatment of silencing dysentery, tinnitus, deafness, insomnia, amnesia and other conditions. Adverse reactions are not clear, but it should be noted that people with yin deficiency and hyperactivity (deficiency of yin fluid and hyperactivity of yang qi), excessive sweating and slippery semen should be cautious in taking the drug. The use of drugs need to be under the guidance of a professional physician, do not use without authorization, so as not to produce to the adverse consequences.