Wuju does not need to be decocted first, regular decoction is sufficient. The first decoction is generally to increase the dissolution of the active ingredients of hard drugs, or to achieve the purpose of reducing toxicity and de-toxicity. General ore drugs, because the active ingredients are not easy to dissolve, the first decoction can increase the solubility of the drug, give full play to the efficacy of the drug; part of the toxic drugs, the first decoction can reduce the toxicity of the drug. Cornus officinalis is the dried, nearly mature fruit of Cornus officinalis, Cornus officinalis or Cornus officinalis, family Rutaceae. Its effects include dispersing cold and relieving pain (relieving pain by removing cold from the body), lowering the rebelliousness and stopping vomiting (stopping the upward rush of gastric qi and stopping vomiting), and aiding yang and stopping diarrhea (stopping diarrhea by promoting the generation of yang qi). It is used in treating syncopal headache (headache caused by evils invading the syncopal meridian), cold hernia and abdominal pain (acute abdominal pain caused by coldness in the internal organs and external wind-cold), cold-dampness in the feet (numbness and soreness in the legs and feet caused by cold-dampness), menstrual abdominal pain, distension of the epigastrium (stomach), vomiting and swallowing acid (swallowing of acid in the stomach that rushes upward to the mouth and throat), and wu wei yi yi diarrhea (diarrhea before dawn). It should be noted that Wu Zhu Zhu has a small toxicity, with a dosage of 2 to 5 g for internal use and moderate amounts for external use. Although there is no clear adverse reaction to Wu Zhu, it is recommended to take the medicine under the guidance of a Chinese medicine practitioner to identify the symptoms, and not to take the medicine on your own to avoid delays or adverse reactions.