Phellodendron Bark is a kind of traditional Chinese medicine, which has the efficacy of clearing heat and drying dampness (removing heat and drying dampness), diarrhea and detoxification (removing fire and poison from the body), and removing bone vapor. Huangbai can be used to treat damp-heat leucorrhoea, feverish drenching (burning and stinging pain when urinating, accompanied by frequent urination and urgency, and discomfort in the abdominal region), astringent pain, damp-heat diarrhea (diarrhea caused by damp-heat), jaundice, damp-heat athlete’s foot, impotence, bone vapor and laborious heat, night sweating (abnormal sweating after falling asleep, but stopping after waking up), spermatorrhea, sores, swollen toxins and itching of eczema, and other conditions. Phellodendron Bark is bitter and cold in nature, so it not only tastes bad, but also hurts the stomach with bitter cold, which may lead to spleen and stomach deficiency (spleen and stomach weakness and cold), so it is not suitable to drink a large amount of it for a long period of time, and it is not suitable for those who already have a weak and cold spleen and stomach. The adverse effects of Phellodendron Bark are not clear. Chinese medicine in water can not achieve its therapeutic effect as a drug, clinical discomfort should be timely medical treatment, not blindly use Chinese medicine, so as not to cause adverse effects.