Huang Yao Zi is poisonous and has the efficacy of resolving phlegm, dispersing knots and eliminating galls, clearing heat and cooling the blood (relieving blood heat by clearing heat) and detoxifying the toxin. It can be decocted or powdered, etc. Huang Yao Zi, bitter flavor, cold nature; attributed to the lung, liver meridian. Clinically, it is mainly used for the treatment of gall tumors (equivalent to thyroid tumors), sores and swollen poisons, sore throat, and poisonous snake bites. Adverse reactions to Huang Yao Zi: Regular doses of Huang Yao Zi preparations can also cause gastrointestinal reactions such as dry mouth, loss of appetite, nausea, and abdominal pain. Overdose can cause burning pain in the mouth, tongue and throat, salivation (drooling), nausea and vomiting. The dose for internal use should not be too large. Prompt medical attention is recommended in case of discomfort. If medication is needed, it should be diagnosed by a doctor and regulated according to the doctor’s instructions.