It is mainly used for the treatment of wind-cold and flu, wind-dampness paralysis, toothache and other conditions. It is the dried root and rhizome of Aristolochiaceae plant. Its effects include warming the lungs to dissolve fluid (promoting the flow of stagnant fluid by warming the lungs), detoxifying the surface to disperse cold (removing the cold from the surface of the muscles), dispelling wind and relieving pain (dissipating wind and relieving musculoskeletal pain), and promoting the passage of orifices. It is mainly used for treating wind-cold and cold, headache, nasal abyss (mainly manifested as obscene nasal mucus that is too profuse to be wiped away), congested nose, phlegm (a pathological product of impaired metabolism of water-liquid), wheezing and coughing, toothache, and rheumatism-paralysis pain, and so on. Yin deficiency and hyperactivity (deficiency of yin fluid, hyperactivity of yang) of headache and lung dryness and injury to the yin dry cough should not be used fine Xin; fine Xin should not be used with veratrum. It should be noted that if patients need to use fine Xin, it is recommended to use under the guidance of a doctor to avoid adverse reactions and delay the condition.