Deficiency of kidney qi: shortness of breath, spontaneous sweating, listlessness, pallor, frequent urination, nocturnal emission, premature ejaculation, pale tongue coating and weak pulse.
Your premature ejaculation is related to kidney yang deficiency or kidney qi deficiency. These two reasons are similar, and both can be treated with Guifu Dihuang Pill or Gui You Pill. The Liuwei Dihuang Pill you mentioned is nourishing kidney yin, which is not suitable for premature ejaculation and has little effect. If the semen is thin and small, you can consider taking it. The method is to hybridize with Guifu Dihuang Pill.
For reference only, I hope it will help you. If in doubt, you can click hi for consultation.