Shengdi is mainly used for treating diseases such as heat in the blood (the degree of invasion of heat into the human body is deep and the symptoms are more serious), warm toxin spots (warm and hot toxin invades the human body resulting in spots and plaques on the skin), and vomiting epistaxis, etc. It is not the fastest way to say what is the best cure for what disease. Radix Rehmanniae Praeparata belongs to the class of traditional Chinese medicine, which has the efficacy of clearing heat and cooling blood (relieving blood heat by clearing heat), nourishing yin and generating body fluid. It is used in the treatment of heat illnesses that injure the yin, irritating and thirsting of the tongue with reddish-red color, constipation caused by injury of body fluid, heat entering into the camp and blood, spots of warm-heat toxicity, vomiting of blood and epistaxis, fever due to deficiency of yin, bone vaporization and laborious heat, and thirst and internal heat (fever accompanied by symptoms of overeating, excessive drinking, excessive urination, etc.). Adverse effects of Radix et Rhizoma Dioscoreae is not clear, contraindications are spleen and stomach qi deficiency or spleen and yang insufficiency avoid using fresh Radix et Rhizoma Dioscoreae, raw Radix et Rhizoma Dioscoreae, in the middle of the cold, there is a plumping, easy to discharge is prohibited. If you need to use the drug is recommended to be used under the guidance of a traditional Chinese medicine practitioner to identify the evidence, unauthorized use of drugs may cause adverse consequences.