The taking of the root is generally no course of treatment, usually according to the patient’s condition, if the symptoms are not relieved after taking 3 days, it is recommended to consult a doctor, at the same time, pay attention to the indications can follow the doctor’s instructions to identify the use of medication, do not recommend unauthorized use of medication. The root is the dried root of the cruciferous plant woad, bitter taste, cold nature, to the heart, stomach, with heat detoxification, cooling blood and pharyngeal effect, can be used for warm epidemic poison, fever, sore throat, rotting throat Dan Gua Sha (throat red, swollen and vesicant, rash color bright red like Dan), carbuncle and other diseases. Generally speaking, the taking of the root should be decided according to the patient’s condition, can not be taken blindly, if the symptoms are not relieved after taking 3 days, it is recommended to consult a doctor in a timely manner, do not increase or decrease the medication without authorization. In addition, the cold nature of the root, for the body and no real fire and heat toxicity of the person to avoid taking, for the spleen and stomach cold people with caution, the specific should follow the doctor’s instructions, under the guidance of the physician to identify the evidence to be taken.