道家的炼丹术由来已久,当时的目的只有一个:求长生不老,延年益寿。在汉代,魏晋南北朝时期尤为盛行。通常是宫廷聘请民间丹药术士到入宫炼丹。所炼之丹专供皇帝服用,以求长生。经多年验证,服用丹药的皇帝们并没有长生不老,反而由于丹药的慢性中毒,都没有达到长寿目的。晋代的葛洪发现丹药对于外科的痔疮有奇特的疗效。 Taoist alchemy has a long history, only one purpose: seeking longevity, longevity. In the Han Dynasty, Wei, Jin and Southern and Northern Dynasties period is particularly prevalent. Usually the court hired a folk immortality warlock into the palace alchemy. The refining of Dan for the emperor to take, in order to longevity. After years of verification, the emperor taking immortality did not live forever, but because of chronic poisoning immortality, have not reached the purpose of longevity. Ge Hong Jin found that immortality for surgical hemorrhoids have a unique effect.