Huanglian dosage is 2~5g for internal use and appropriate amount for external use. Huanglian is a kind of traditional Chinese medicine, with the effect of clearing heat and drying dampness (removing heat and drying dampness), diarrhea and detoxification (removing fire and poison in the body), it is used for plumping (stomach distension and discomfort), vomiting, heartburn, hot diarrhea and abdominal pain, epistaxis (vomiting blood, nosebleed), carbuncle and swollen, eye and toothache, chancre, and it can be used externally to treat eczema, water and fire burns. The dosage of this product is for internal use, decoction, 2~5g or into the pill, bulk; external use appropriate amount of dressing or decoction of water to wash. Clinically, Huanglian is used in combination with Wu Zhu (Cornus officinalis) for the treatment of liver fire, liver-stomach disharmony (disharmony between the ascending liver and descending stomach) resulting in acid swallowing (swallowing of acid from the stomach upward to the oropharynx) and dysentery; Huanglian is used in combination with Hanxia (Semen xia) for the treatment of phlegm-heat interactions resulting in tightness and distension in the chest and abdomen, platitude (stomach distension and discomfort), vomiting, and gastric fever and vomiting. Adverse effects and contraindications of Huanglian are not known. Caution should be taken when taking this drug, it is contraindicated for people with spleen and stomach deficiency and cold (spleen and stomach weakness and cold), and caution should be taken for people with yin deficiency and fluid injury. If you need to use the drug, you need to use it under the guidance of a traditional Chinese medicine practitioner, and you should not use the drug on your own to avoid adverse effects on the body.