The most important herb to clear internal heat, especially in the qi and yang ming levels.
Clears heat, drains fire (heavy, descending) - high fever with no chills, excessive thirst, sweating, flooding and big pulse (the "4 bigs"), irritability, red tongue with yellow coat.
Clears excess lung heat - cough, wheezing, fever, thick yellow sputum.
Clears blazing stomach fire - headache, toothache, painful and swollen gums.
Topically for eczema, burns, ulcerated sores; may also be taken internally.