As a Chinese herbal medicine, the dosage is related to the disease and the population, which should be determined by a doctor and cannot be generalized. Generally speaking, the dosage of decoction is 6-60g, and the appropriate amount for external use. This product is the dried whole herb of Cynanchum sativum, family Cynanchaceae, with slightly bitter taste, sweet, cold nature, has the effect of clearing away heat and detoxification (clearing away heat and toxicity in the body), dispersing knots and eliminating swellings, inducing dampness and clearing away drenching, can be used for carbuncle, swollen sores and poisonous sores, sore throat, venomous snake bites, heat drenching (burning and stinging pain is obvious during urination, accompanied by urinary frequency, urgency, and discomfort from traction on the abdomen), astringency and pain, and damp-heat jaundice and other medical conditions. This product can be decocted and used externally, the amount of decoction should be determined by a doctor, generally 6 to 60g, if used externally, according to the condition of the appropriate amount of use. It should be noted that this product is contraindicated for people with yin gangrene (a general term for a class of slow-acting negative sores and ulcers) and deficiency cold of spleen and stomach, and should be used with caution in pregnant women. Specific use should also be carried out under the guidance of the physician’s diagnosis, and should not be used blindly on its own.