In Chinese medicine books, they are all classified as "heat-clearing and detoxification" drugs: Radix Isatidis: bitter and cold in nature. Heart meridian and stomach meridian. Has the effects of clearing away heat and toxic materials, cooling blood and relieving sore throat. Clinical application 1. Used for fever, headache, sore throat or body rash. 2. Used for big head plague and erysipelas mumps. Usage and dosage: decocted, 10~ 15g. Pay attention to the use of spleen and stomach deficiency and cold. Pharmacological action The water extract of this product has inhibitory effect on Bacillus subtilis, Staphylococcus aureus, Escherichia coli, Salmonella typhi and Shigella dysenteriae. It has obvious inhibitory effect on PR2 strain of influenza virus. It can enhance immune function and resist ADP-induced platelet aggregation. Folium Isatidis tastes bitter and cold. Heart, lung and stomach meridians. The effects of clearing away heat and toxic materials, cooling blood and removing spots. Clinical application 1. Used for erysipelas, aphtha and sore throat. 2. Used for exogenous wind-heat and fever. 3. Used for heat entering blood and high fever macula. Usage and dosage: decocted, 10~ 15g. Pay attention to the use of spleen and stomach deficiency and cold. Pharmacological action The decoction of this product has inhibitory effect on Staphylococcus aureus, Streptococcus A, Pneumococcus, Shigella dysenteriae and Bordetella pertussis. (antibacterial) and can inhibit influenza virus, mumps virus, etc. (antiviral) can enhance the phagocytosis of white blood cells. It contains "Indirubin", which can inhibit transplanted tumors. It also has liver protection, anti-inflammatory and antipyretic effects. {The above is taken from the 2 1 century course textbook, Chinese Medicine of People's Health Publishing House, edited by Huang Zhaosheng.}