The dosage of Chinese medicine refers to the portion size for clinical application. Anti-epidemic drugs are generally relatively calm and have a wide range of safety. However, the dosage of certain drugs that are highly potent and toxic must be strictly controlled. The dose of antiepidemic drugs is as follows: 1. The influence of disease, physical condition and age on the dose. For patients with mild illness, the dosage should be light; for patients with acute illness, the dosage should be heavy; for patients who are strong, the dosage should be heavy; for the elderly, young, fetus, childbirth or those who have been weak for a long time, the dosage should be light; for children, the dosage should generally follow: 1/2 of the adult dosage for children aged 6 to 10 years old and 1/4 of the adult dosage for children under 5 years old. The dosage should not be too high for the strong sweating medicine. The use of this medicine should be cautiously applied to those who have superficial evidence, such as spontaneous sweating, yin deficiency sweating, sores and ulcers for a long time, gonorrhea and blood loss. 2. Increase or decrease the dosage according to the time and place. Such as spring and summer coup lax, dosage should be light, winter coup dense, dosage should be heavy, the northern cold areas, dosage should be heavy, the southern hot areas, dosage should be light. 3, the nature of different drug dosage is different. Heavy and light in nature, available in larger doses; light and strong in nature, available in smaller doses; large toxicity, harsh nature of the drug, the dosage should be small. Plant flowers, leaves and aromatic products, the dosage should be light; roots, fruits and other thick and nourishing drugs, the dosage should be slightly heavier. In addition, the dosage is heavier than the compound dosage, and the dosage in soup is more than double that in pill and powder. In addition, this product is mostly pungent and dispersed, so it should not be decocted for a long time in soup to avoid volatilization of the active ingredients and reduce the efficacy of the medicine.