Kidney yin deficiency with mild symptoms can be effective within 1 month, while those with more severe symptoms need 3~5 months, the exact duration is not fixed, and needs to be specifically combined with the condition as well as the physical condition in order to judge. If the symptoms of kidney yin deficiency are mainly manifested as hot flashes (a burst of fever), night sweating (abnormal sweating after going to sleep and stop sweating after waking up), etc., and the duration of the disease is shorter and the symptoms are less severe, then you can take six flavors of dihuang, and the symptoms of kidney yin deficiency can usually be improved within 1 month, but it is not absolute, and the specific length of time varies from one person to another. If the symptoms of kidney yin deficiency are mainly manifested as impotence, spermatorrhea, premature ejaculation, etc., and the duration of the disease is longer and the condition is more serious, then it is necessary to regulate for at least 3 months before the symptoms can be improved, and also the specific length of time varies from person to person. The treatment of kidney yin deficiency requires a certain degree of patience, should be regulated under the guidance of a doctor, not self-medication, if you are not feeling well, you should consult a doctor in a timely manner.