How many grams of American ginseng in water is recommended to be decided by the physician according to the individual’s situation, but American ginseng in water has limited efficacy and can not be used as a substitute for medication. Radix Panax Ginseng is sweet, slightly bitter and cool in nature. It can be used to treat deficiency of qi and yin, deficiency of heat, coughing, phlegm and blood, internal heat and thirst (internal heat accompanied by symptoms such as eating, drinking and urinating), dry mouth and throat, etc. However, the amount of medicinal ingredients extracted from Radix Panax Ginseng in water is small and cannot reach the goal of treatment. However, the drug components analyzed in American ginseng soaked water are less and cannot achieve the purpose of treating diseases, so it is not recommended to use American ginseng soaked water for drinking by oneself. Attention should be paid to the deficiency of middle Yang, cold-dampness obstruction (cold-dampness blocking the spleen and stomach in the middle) and Qi depression and fire, etc. All the solid evidence and fire depression are not suitable for taking this medicine. Radix Panax Ginseng is not suitable to be used together with Veratrum. Chinese medicine emphasizes on the identification and use of medicines, the use of Chinese herbal medicines should be under the guidance of doctor’s identification, and should not be used blindly by oneself.