How many slices of American ginseng should be put in water should be determined according to the need, not generalized, the common dosage of American ginseng is 3~6 g, but water can not fully play its therapeutic effect, if there is a need for medication, it should be consulted with a physician. Radix Panax Ginseng is sweet, slightly bitter and cool in nature. It is a traditional Chinese medicine with the effects of tonifying qi, nourishing yin, clearing away heat and generating body fluid; it is used to treat symptoms of qi deficiency and yin deficiency, such as cough with phlegm and blood, and it is also effective in treating symptoms of deficiency and heatiness, as well as thirst. Its common use is to be decocted in water or put into pills, and the number of slices to be put in should depend on the dosage and the condition of the patient. Adverse effects of American ginseng are uncertain, not used with quinoa, and forbidden for people with cold and damp stomach. If there is a need for medication, it should be used under the guidance of a doctor, and should not be used blindly by oneself to avoid adverse effects.