The traditional Chinese medicine Isatis indigotica is a kind of heat clearing medicine. It is the dry root of Isatis indigotica, a cruciferous plant.
Banlangen has the effects of clearing heat, detoxifying, cooling blood and promoting pharynx.
Banlangen is used for epidemic poisoning, fever and sore throat, mild toxic spots, mumps, rotten throat, big head plague, erysipelas, and carbuncle.
Banlangen is bitter cold, so those with spleen and stomach deficiency should take it carefully.
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