What is the efficacy and function of Rhizoma Coptidis?

Efficacy of coptis chinensis: clearing heat and promoting diuresis, purging fire and detoxifying. Can be used for treating damp-heat fullness, vomiting and diarrhea, jaundice, high fever and dizziness, hyperactivity of heart fire, insomnia, blood-heat vomiting, toothache, thirst quenching, carbuncle and furuncle; Externally used to treat eczema, wet sores and pus in ear canal. Wine coptis is better than clearing fire. It is used for treating aphtha with red eyes. Turmeric even clears the stomach and stops vomiting. Used for cold and heat, damp-heat with yin, fullness and vomiting. Yuhuanglian soothes the liver and stomach to stop vomiting. Used for disharmony between liver and stomach, vomiting and acid swallowing.