① Pinellia ternata is poisonous, which causes vomiting, sore throat and aphonia. Generally, it is not taken orally, but mostly used externally. It is used for sores, carbuncle, swelling, phlegm and cough. (2) Processed Pinellia ternata can reduce toxicity, alleviate medicinal properties and eliminate side effects. ③ Pinellia ternata is good at resolving phlegm, mainly for eliminating dampness and resolving phlegm. It is used for cough due to damp phlegm, phlegm-heat accumulation, wind-induced phlegm vomiting, phlegm and saliva condensation, and it can't be vomited. ④ Jiang Banxia has enhanced the function of lowering adverse reactions and stopping vomiting, mainly warming the middle warmer to resolve phlegm, lowering adverse reactions and stopping vomiting, which is used for vomiting due to phlegm retention and fullness of stomach. ⑤ Pinellia ternata is inclined to dispel cold phlegm and has the function of harmonizing spleen and stomach, which is mostly used for cough with excessive phlegm and dizziness due to phlegm drinking. It is also used in traditional Chinese medicine prescription preparations.