Zuo Gui Pill is not recommended for long-term use. As a tonic, Zuo Gui Pill nourishes Yin and tonifies the kidneys, and the side effects of the drug are not significant, but it is not suitable for regular consumption. This is because frequent consumption can harm the liver and kidneys and can lead to stagnation of the spleen and injury to the stomach, especially in patients with spleen deficiency. If the desired therapeutic effect is achieved, there is no need to continue taking the medicine for the safety of the drug. If there is no significant improvement in symptoms after or during two weeks of taking the medicine, or if the symptoms will worsen, the medicine should be stopped immediately and a hospital visit should be made. Zuo Gui Wan is mainly a medicine to nourish Yin and kidney, which can treat some symptoms caused by deficiency of Kidney Yin, such as soreness of the waist and knees, spontaneous sweating, night sweating, seminal emission, frequent urination, incomplete urination or blurred eyes, deafness, dry mouth and tongue.