Guanzhong is a traditional Chinese medicine, which mainly has the effects of clearing heat and removing toxins (removing heat and toxicity from the body), cooling the blood and stopping bleeding (cooling and moisturizing the blood and preventing bleeding), and repelling worms. Because of the small toxicity of this product, large doses can lead to poisoning, headache, dizziness, dyspnea, abdominal pain, diarrhea and other toxic side effects. The drug source of Guanzhong is the dried rhizome and petiole residue of the thick-stemmed scaly fern of the Scaly Fern family, also known as Mianma Guanzhong, which is bitter in taste, slightly cold in nature; slightly poisonous; attributed to the liver and stomach meridians, with the effects of clearing heat and removing toxins (removing heat and poisonous evils in the body) and repelling worms, and it is mainly used in treating wind-heat and colds, temperature-poisoned spotting (the invasion of warm-heat poisonous evils into the body leading to skin blotches and plaques), bleeding from blood-heat and worms diseases. Because this product has a small poison, so the dosage should not be too large, and its bitter cold taste, so the spleen and stomach cold (spleen and stomach weak cold) and pregnant women should be used with caution, the specific use of the physician’s evidence should also be carried out under the guidance of, so as to avoid adverse reactions or misunderstanding of the condition.