The characteristics of Liu Wei Di Huang Wan are “three tonics and three diarrheas”. The three tonics are for the kidney, liver and spleen, mainly due to the three herbs Shu Di Huang, Cornu Cervi Pantotrichum and Shan Yao; the three diarrheas are also for the kidney, liver and spleen, but it is Ze Di, Mudan Pi and Fu Ling that are at work. Therefore, it is not a pure tonic, but a combination of tonic and diarrhea, more suitable for those who nourish kidney yin, especially kidney yin deficiency. To determine if you are Yin deficiency, first look at the tongue, such as red tongue and often dry mouth; then look at the pulse, whether the pulse is thin and beating fast; finally, whether you often have hot flashes, night sweats, insomnia, dizziness, soreness and weakness of the waist and knees. If young people, or those with damp heat in the liver and spleen or lung heat take it, it will aggravate damp heat and may lead to sores on the mouth and tongue and yellowing of urine. Even if it is suitable to eat, you should quit smoking and alcohol and eat less stimulating food. In addition, Liu Wei Di Huang Wan is not conducive to dispersing evil, so it is best not to take it when you have a cold. It is also prudent to take it if you have a weak spleen and stomach, thin stools, or indigestion. In Yang deficiency, the tongue is light and tender, and the pulse is sunken and slow and fearful of cold. If they are male, they will also have erection problems. These people are more suitable to use Jin Kui Kidney Qi Pill. It should also be reminded that this medicine should not be taken with Rifampin. This is because it contains shamrock, which is sour in taste and can precipitate a lot of organic acids, and using it together will increase the toxicity of the drug to the kidneys. Although Liu Wei Di Huang Wan is a flat tonic, it should not be taken as a vitamin every day. It is generally advocated to take a month and then stop for a week; or take a week and stop for a day or two to allow the body to recuperate properly. For all kinds of diseases, there are also differences in the time of taking. For example, menopause syndrome should be used for several months or even six months. Chronic fatigue is recommended to be used for half a month first. If used to treat hypertension, it may need to be taken for a long time. Some patients are born with liver and kidney yin deficiency and have no discomfort even after taking it for several years, but the liver and kidney functions should be closely tested. In addition, long-term use of Liu Wei Di Huang Wan may hinder the spleen and stomach from transporting and transforming. It is best to take it 10-15 minutes after a meal or use some digestive Chinese medicine under the guidance of a doctor.