The adverse effects of Niu Huang Qing Xin Wan are not known. However, it should be noted that pregnant women should be cautious, and athletes should be cautious. In addition, the prescription of this product may contain cinnabar, andrographis, should not be overdosed for a long time, and should be used with caution in patients with liver and kidney insufficiency. Niu Huang Qing Xin Wan can clear the heart and resolve phlegm (clearing and removing heart fire and resolving phlegm), and subdue fright and dispel wind (subduing fright and dispelling wind evil). It is used for dizziness and dizziness caused by wind-phlegm obstruction (wind-phlegm evil Qi blocking the head and orifices), phlegm-saliva congestion (abnormal phlegm, excessive production of saliva), confusion, and convulsions of convulsions and epilepsy (pediatric diseases mainly manifested by fainting, twitching and convulsions). This formula is a light agent for clearing heat and opening up the orifices. Clinical evidence is based on body heat and drowsiness, irritability, red tongue with yellow fur, and number of pulses. Patients with high fever, dizziness and closed stroke are also often treated with this drug to relieve some of the related symptoms. The adverse effects of Niu Huang Qing Xin Wan are not clear, so patients should carefully read the instructions and use the drug under the guidance of a physician.