Dry mouth after taking Zhi Bai Di Huang Wan may not be related to the medication itself, or the disease may not have been relieved. Zhi Bai Di Huang Wan is composed of Cornus officinalis, Mudan Pi, Chinese yam, Cortex Phellodendron, Zhi Mu, Radix Rehmanniae Praeparata, Poria, and Ze Xie. It can nourish Yin and lower fire (nourish Yin essence and lower fire). Zhi Bai Di Huang Wan can be used to treat yin deficiency and fire (deficiency of yin and essence in the body, resulting in hyperactive fire), hot flashes (a burst of fever), night sweating (abnormal sweating after going to sleep and stopping after waking up), dry mouth and sore throat, tinnitus, seminal emission, and short and red urination (small amount of urination with dark yellow color). After taking Zhi Bai Di Huang Wan, dry mouth may be caused by salty food and low water intake, which can be relieved by drinking more water; Zhi Bai Di Huang Wan is used for treating the evidence of yin deficiency and fire exuberance, because of the exuberance of deficiency fire in the body, which burns the body fluids, so the patient will have the symptom of dry mouth, and when the condition has not yet been relieved after the use of the medicine, the patient will still have dry mouth performance. Patients are advised to use the medicine under the guidance of a doctor.