Analysis of illness: people with three constitutions should not take Liuwei Dihuang pills; Second, it is not suitable for people with obvious kidney yang deficiency: kidney yang deficiency is mostly manifested as pale face, weak waist and knees, weak constitution, and warm and cold. Many patients with erectile dysfunction think that it is caused by kidney deficiency, so they take Liuwei Dihuang Pill on their own initiative, but it is often counterproductive. Because the kidney is only an important organ of the urinary system, it is not directly related to the strength of sexual function. Third, it is not suitable for people with kidney yin deficiency but poor spleen and stomach function: Although Liuwei Dihuang Pill is a drug that tends to tonify yin, there are many drugs for nourishing yin in the prescription, and people with poor stomach function will hinder digestive function after eating it, so even if you are a person with kidney yin deficiency but poor spleen and stomach function, it is not recommended to take it.