There is no precise answer to the question of how long Gui Fu Di Huang Wan can be taken to change kidney yang deficiency (insufficient yang energy in the kidneys), which needs to take into account the extent of the patient’s disease, the patient’s own physical condition and other factors. Gui Fu Di Huang Wan is a common Chinese medicine with the effect of tonifying kidney yang. It is mainly used to treat many symptoms caused by kidney yang deficiency. It mainly consists of Cornus officinalis, Chinese yam, Radix Rehmanniae Praeparata, Rhizoma Zedoariae, Dampy, Poria, Cinnamon, Radix et Rhizoma Polygoni Multiflori, and mainly treats the symptoms of yang deficiency caused by insufficiency of kidney yang such as soreness and coldness of the lower back and knees, dysuria, impotence and other symptoms of yang deficiency. If the yang deficiency lasts for a long time, it needs to be taken for a long time until the symptoms improve, because Chinese medicine believes that the pill itself is meant to last for a long time, and it mainly treats chronic diseases, so it can be convenient to take the medicine. It should be noted that, although there is no clear adverse reaction to Gui Fu Di Huang Wan, it is prohibited for pregnant women, and it is best to use it after the identification of a Chinese medicine practitioner.