Zuo Gui Wan is effective in nourishing yin and tonifying the kidney, and has the function of treating lumbar soreness and weakness of the knees, hot flashes (a burst of fever), night sweating (abnormal sweating after going to sleep, and sweating stops after waking up), and fatigue (mental exhaustion and physical weakness) caused by deficiency of kidney yin. The contraindication of this medicine is that it should not be taken by pregnant women and children. Zuo Gui Wan is composed of Semen Cuscutae, Achyranthes Bidentatae, Radix Rehmanniae Praeparatae, Colla Cornu Cervi Pantotrichum, Rhizoma Coptidis, Rhizoma Coptidis, Cornus Cornu Cervi Pantotrichum, Radix Angelicae Sinensis, Fructus Lycii, and so on. It has the effect of nourishing yin and tonifying the kidneys and can be used in treating the conditions such as soreness of waist and weak knees due to the deficiency of yin of the kidneys, hot flashes and night sweating, mental fatigue (tiredness of spirit, physical fatigue), and dry mouth and throat. The adverse reactions of Zuo Gui Wan are not clear, but it is prohibited for pregnant women and children. Meanwhile, avoid eating greasy food while taking it. If there is a need for medication, it is recommended to go to a regular hospital for consultation and treatment under the guidance of a professional doctor to identify the symptoms.