中药大黄是著名的泻下通便药,可使火热从肠道排出。因此用以治热毒疮疡等症,用大黄研末外敷可消肿块,有止痛消炎之功,如配甘草有止吐作用。一味大黄还治痢疾。传说宋代元祐五年春,蕲、黄两郡痢疾流行。宋哲宗下令,召天下各医献方,许多人的方均无效。最后黄郡一知府献方名叫“大 Rhubarb is a well-known purgative laxative that can exhale heat from the intestines. Therefore, it is used to treat heat poison sores and other diseases. External application of rhubarb powder can reduce the mass, and it can relieve pain and reduce inflammation. For example, licorice can prevent vomiting. Bitter rhubarb also cures dysentery. It is said that in the Song Dynasty Yuanyou five years of spring, the dysentery of the two counties in the Sui and Huang counties was prevalent. Song Zongzong ordered that all the doctors in the world be called, and that many of them were ineffective. In the end, the name of the prefectural government of the Yellow County is “Great.”