Hello: Coptis chinensis belongs to Chinese medicine for clearing away heat and dampness, which has the effects of clearing away heat and dampness, purging fire and detoxifying; Coptis chinensis can be used for various diseases caused by damp heat, especially for diarrhea, dysentery and vomiting caused by gastrointestinal damp heat. It can also be used for excess fire in heart, stomach, liver, gallbladder and other viscera; The yellowing of the tongue coating after taking Coptis chinensis is caused by the color of the medicine, which will not affect it, and will disappear automatically after 3-5 days.