Dihuang can be taken as raw dihuang or cooked dihuang after concocting, and in the method of consumption, it can be taken in soup. 1. Raw Dihuang has the efficacy of clearing heat and removing toxins (removing heat and toxins from the body), nourishing yin and generating fluids, and clearing heat and cooling the blood (relieving blood heat by clearing heat). It can be used in the treatment of warm-heat diseases in which heat enters the camps and the blood (the degree of invasion of heat into the human body is deep, and the symptoms are more serious), warm-toxicity spotting, heat diseases that injure the yin, internal heat and thirst, heat in the yin, and bone vaporization and laborious heat, and other diseases. In the use of the drug should be noted that the adverse effects of the drug is not clear, but patients with spleen deficiency and loose stools should not take. 2. Radix Rehmanniae Praeparata has the effect of tonifying blood and nourishing yin, benefiting the essence and filling in the marrow, and can be used in the treatment of blood deficiency and atrophy, palpitation and dizziness, irregular menstruation, yin deficiency of the liver and kidney, and tidal fever of bone vapor. When using it, it should be noted that spicy, stimulating and greasy food should be avoided during the period of taking it. In the method of use, it is usually taken in soup with other ingredients, such as stewed soup with hen. However, the use of soup is limited, and can not replace the drug treatment of disease. If necessary, it is recommended to go to a regular hospital, under the guidance of a professional physician to identify the treatment.