Yam bean root is toxic, its dosage is usually 3~6g, if overdose is easy to be poisoned, leading to nausea, vomiting and other adverse reactions. Chinese medicine Yam bean root is poisonous, its dosage is usually in 3~6g, overdose can easily lead to nausea, diarrhea, vomiting, abdominal pain, palpitation (rapid heartbeat, often accompanied by panic), chest tightness, fatigue, dizziness and headache, etc., or even cold limbs (cold limbs, or even cold to the elbows and above the knees), convulsions and so on. Therefore, it must be used within the safe dosage range, and must not be overdosed. Yam bean root is cold in nature and bitter in taste. It belongs to the lung and stomach meridians. Its effects are clearing heat and removing toxins (removing heat and toxicity from the body), subduing swelling and relieving sore throat. It can be used clinically to treat sore throat, swollen and painful gums, lung-heat cough, and damp-heat jaundice. It is contraindicated in cases of deficiency and coldness of the spleen and stomach (spleen and stomach weakness and cold) and diarrhea. Adverse reactions are not clear. Patients with discomfort are advised to consult a doctor in time and use the drug as prescribed by the doctor.