The side effects of Zuo Gui Wan are unclear; its contraindications are, contraindicated in pregnant women and prohibited in children. Zuo Gui Wan is composed of Radix Rehmanniae Praeparata, Semen Cuscutae, Radix Achyranthis Bidentatae, Colla Corii Asiatica, Colla Cornu Cervi Pantotrichum, Fructus Lycii. It has the effect of nourishing the kidney and tonifying yin. It is used for lumbago and knee weakness caused by deficiency of true yin, night sweating (abnormal sweating after going to sleep and stopping sweating after waking up), mental fatigue (lack of spirit) and dry mouth. Avoid oily food during the period of consumption. Not suitable for patients with colds. If there is no improvement in the symptoms after two weeks or during the period of taking the medicine, or if the symptoms worsen, or if new serious symptoms appear, stop taking the medicine immediately and go to the hospital for consultation. If you need to use Zuo Gui Wan, it must be used under the guidance of a professional doctor.