There is no specific time for how long to take American ginseng, it depends on one’s physical condition and recovery from illness, so it is impossible to make a generalization. American ginseng is the dried root of American ginseng, family Wujiaceae. It is sweet, slightly bitter and cool in nature. It belongs to heart, lung and kidney meridians. It has the effect of tonifying qi and nourishing yin, clearing heat and generating fluids. It is used in treating deficiency of qi and yin, deficiency heat and tiredness, coughing, asthma, phlegm and blood, internal heat and thirst (internal heat accompanied by eating, drinking and urinating), and dry mouth and throat. If it is used for health care, it can be taken for a few days according to one’s own condition. If it is used for treating diseases, it should be taken according to the recovery of the disease, and should be taken according to the doctor’s prescription.