“相须”、“相使”首见于《神农本草经》,序录中云:“药有阴阳配合,子母兄弟,……有单行者,有相须者,有相使者,……凡此七情,合和视之。当用相须相使者良……”其中没有对相须、相使的含义作出具体解释,只提到临床应用的原则———“当用相须、相使者良”。“当用”不外乎使治 The “phase must” and “phase” were first seen in the “Shen Nong’s Materia Medica”, and the prologue in the cloud: “There is yin and yang in the medicine, the brothers and daughters, ... there are single trips, there must be those who need to be, there are relatives, ... Where The seven emotions, the harmony and the view. When the phase must be used to make the good ...” There is no specific explanation for the meaning of the phase must be, only to mention the principle of clinical application - “When the phase should be, phase Messenger is good.” “When to use” is nothing more than to make governance