Zuo Gui Wan is indicated for cases of kidney yin deficiency (deficiency of yin and essence in the kidneys), and is generally used with caution in patients with spleen deficiency. Zuo Gui Wan is composed of Radix Rehmanniae Praeparata, Semen Cuscutae, Radix Achyranthis Bidentatae, Radix Kamehameha Gum, Radix Deer Antler Gum, Rhizoma Dioscoreae, Cornu Cervi Pantotrichum and Fructus Lycii. It has the effect of nourishing the kidney and tonifying yin (nourishing the yin essence of the kidney). It is used in treating deficiencies of true yin (kidney yin), lumbar soreness and knee weakness, night sweating (abnormal sweating after going to sleep, but sweating stops after waking up), mental fatigue (lack of mental energy), and dryness of mouth. This formula is more yin-soft and nourishing and greasy (the side effect of the drug generates dampness, greasy and stagnant, which will impede the transport function of the spleen and stomach) products, easy to stagnate the spleen and hinder the stomach, so be careful when using this product for those who have a deficiency of the spleen and have loose stools (thinning of feces and not shaped); for long-term use, it is advisable to match the products with the spleen and help transport (aromatic and dampness-boosting and spleen-strengthening medicines to eliminate dampness and boost spleen qi, in order to treat the spleen for dampness and the disease of transport and transformation powerlessness). This product is contraindicated in pregnant women, children are prohibited, avoid greasy food, allergy to this product is prohibited, allergic persons should be cautious, take the drug for two weeks or during the period of no improvement in symptoms, or symptoms aggravated, or the emergence of new serious symptoms, the drug should be discontinued immediately and go to the hospital for medical attention.