The herb Fa Xian Xia (法半夏) has the effect of resolving phlegm and drying dampness, and can improve phlegm-phlegm vertigo and palpitations (vertigo and palpitations caused by phlegm-phlegm evil), wind-phlegm vertigo, phlegm-phlegm coughing and asthma, phlegm-phlegm headache (headache caused by phlegm-phlegm evil blocking the qi mechanism) and other conditions. Fahanxia is warm and pungent in nature, and can enter the spleen, stomach and lung meridians. This drug is made from the dried tubers of Fahanxia, a plant in the family of Tennessee, which is weaker than Fahanxia in its medicinal properties, but it still has the efficacy of drying dampness and resolving phlegm (removing phlegm evils in the body with dampness-drying medicines), and it is suitable for conditions such as phlegm and coughing, phlegm and phlegm palpitations, wind-phlegm and phlegm dizziness and phlegm-concussive headache. Fahanxia is warm and dry in nature, patients with yin deficiency and dry cough, fluid injury and thirst, blood evidence (non-physiological bleeding disorders) should be prohibited from using this drug, the adverse effects of this drug are not clear, in addition, this drug should not be used with Chuanwu, Chuanwu, Caowu, Caowu, epiphyllum, and other medicines. Fahanxia is often used with other traditional Chinese medicines in traditional Chinese medicine formulas, the specific use of medication should follow the doctor’s instructions, not self-medication.