Crowberry has the effects and functions of clearing heat and removing toxins (removing heat and poisonous evils from the body), stopping dysentery, and stopping malaria, etc. Its side effects are a certain degree of irritation and damage to the stomach as well as the liver and kidneys, and may irritate the skin when used externally. This product is toxic and should be used with caution. Crowberry is a traditional Chinese medicine, is the dried mature fruit of Crowberry in the genus Crowberry, family Bitterwoodaceae, which is bitter in taste, cold in nature, with a small toxicity, and belongs to the large intestine and liver meridian. It has the effect of clearing away heat and detoxification, stopping malaria, stopping dysentery, and corroding warts (sarcoma on the skin) externally, and is mainly used for the treatment of feverish blood dysentery (dysentery caused by feeling heat and venom, and seeing blood in the stools), cold accumulation of prolonged dysentery, malaria of all kinds, and corns and warts. Because of the poisonous nature of crow’s gall, it is not suitable for decoction, and should be used externally in moderation. When taken internally, the dosage should be strictly controlled and not taken in excess. In addition, when used externally, because of the large irritation, the surrounding normal skin should be protected with adhesive tape to prevent irritation to the normal skin. It should be used with caution in patients with gastrointestinal bleeding and liver or kidney disease, and should also be used with caution in pregnant women and children. If you need to use this product, it should be carried out under the guidance of a physician, do not unauthorized use of medication, so as not to cause adverse reactions.