Guifu Dihuang Pills warm and nourish kidney yang; Lizhong Pills warm the middle and dispel cold. The combination of the two medicines can warm and nourish the spleen and kidneys, and can be used for spleen and kidney yang deficiency. As long as you have spleen and kidney yang deficiency, you can take it for a long time. If the spleen and kidney yang deficiency is eliminated, these two medicines cannot be taken. Therefore, Guifu Dihuang Pills and Fuzi Lizhong Pills cannot be taken as tonics for a long time, and whether to take them should be determined according to the specific condition.