此药本无名，因先生遇老人于山，自云姓徐，指而授之，乃号徐仙芝方散，皆以为名。
按仙芝圆者为阳，方者为阴，阴阳对生，面青，背紫黑色，根盘如蜈蚣，四叶对芳，五月而
花，有花无实，凌冬不凋，丛秀异于它草，生深山大泽于水石之间。采以五月五日，采讫择
根令齐，便于急水中摆去沙土，挂于微带风日处，不可大把叠束，恐烂不佳，而气味无力，
方圆各收一处，不可相杂，即干，临时用方圆两根，各作一包，无令差误。每用磨子磨之，
不得近铁，取极细为度。忌僧尼妇人孝子鸡犬一切厌秽见之。拣天德月德天医，或七月七日
吉日合之，根据此法则其验如神。寻常疏纵不根据此法，则功效便迟矣。即尊奉此药，不可不虔
。为制造杀毒定疮，即以为散，用酽醋调之。根敷其头，圆者敷其右，方者敷其左，一个时
辰当住。大痛若不住，加一服，又不住可加后药∶
仙芝根叶（共一两半） 梓寄生（半两） 夜明砂（一两）
上根据前法浓调敷之，风毒盛极加赵侯须（一两，本草名败酱） 丝瓜（半两，生者佳，冬
，可预霜前收，临时末之以敷。生者则细切，石臼中杵，绞汁，以一盏当一两，不用醋调，
只用汁调。更佳。此物亦有阴阳，长瘦为阳，短肥为阴，可偶用之）如烟浆沸泼风毒火丹，
者可加夜明砂（通前半两）、真牛黄（一字）、犀角（水磨半钱，不然细末之）根据前法，不用醋调
，以丝瓜汁，犀角磨水调敷。
此药原本没有名字，因为先生在山中遇到一位老人，老人自称姓徐，指着这种植物传授给他，于是命名为“徐仙芝方散”，大家都因此称它为这个名字。
考察仙芝圆形的属于阳，方形的属于阴，阴阳相对共生。其叶片正面青色，背面紫黑色，根部盘结形状像蜈蚣，四片叶子对生（注：原文“芳”疑为“生”或“放”之误，结合语境及植物特征，此处指叶子的生长形态，译为“对生”），五月开花，有花无果实，越冬不凋谢，丛聚秀丽异于其他草木，生长在深山大泽的水石之间。在五月五日采集，采完后挑选根部使其整齐，在急水中摆动去除沙土，挂在微带风日之处晾干，不可大把叠束堆积，恐怕会腐烂变坏，导致气味微弱无力。圆形和方形要分别存放在一处，不可混杂，待干燥后，临时使用时取圆形和方形各两根，分别包好，不要弄错。每次使用时用磨子研磨，不得接触铁器，以磨得极细为标准。忌讳僧尼、妇人、孝子、鸡犬等一切污秽之物看见。选择天德、月德、天医日，或者七月七日的吉日进行配制，如果遵循此法，疗效如神。平时疏忽放纵不遵循此法，则功效就会迟缓。既然尊奉此药，不可不虔诚。
为了制造杀毒定疮的药散，用浓醋调匀。根部敷在患处头部，圆形者敷右侧，方形者敷左侧，一个时辰内应当见效。若剧痛不止，加服一剂；若仍不止，可加用以下药物：
仙芝根叶（共一两半） 梓寄生（半两） 夜明砂（一两）
以上药物根据前述方法浓调后外敷。若风毒极盛，可加赵侯须（一两，本草中名为败酱）、丝瓜（半两，新鲜者佳，冬季可预先在霜前采收，临时研末外敷。新鲜者则细切，在石臼中捣碎，绞取汁液，以一盏当一两使用，不用醋调，只用汁调，效果更好。此物也有阴阳之分，长瘦的为阳，短肥的为阴，可配合使用）。若如烟浆沸泼般的风毒火丹，可加夜明砂（通计前半两）、真牛黄（一字）、犀角（水磨半钱，否则研成细末）。根据前述方法，不用醋调，用丝瓜汁、犀角磨水调匀后外敷。
This medicine originally had no name. Because the Master met an old man in the mountains who claimed to be surnamed Xu, and pointed out this plant to instruct him, it was named "Xu Xianzhi Fang San" (Mist Immortal Rhombic Powder), and everyone henceforth called it by this name.
According to tradition, the round form of Xianzhi belongs to Yang, and the square form belongs to Yin; they are born in opposition as Yin and Yang. The leaf surface is green, and the back is purple-black. The root tuber resembles a centipede in shape, with four leaves growing opposite each other. It flowers in May, has flowers but no fruit, does not wither in winter, and grows in clusters, distinct from other herbs. It grows in deep mountains and large marshes among water and stones. It should be harvested on the fifth day of the fifth lunar month. After harvesting, select the roots to make them uniform, wash away sand and soil by swishing them in rapid running water, and hang them in a place with slight wind and sunlight to dry. Do not bundle them tightly or stack them, lest they rot and become inferior, resulting in weak odor and potency. Store the round and square forms separately in different places; do not mix them. Once dried, when used temporarily, take two roots each of the round and square forms, pack them separately, and ensure no confusion occurs. When using, grind them with a millstone; do not let them touch iron. Grind until extremely fine. Avoid letting monks, nuns, women, mourners, chickens, dogs, and all unclean things see it. Select auspicious days such as Tiande, Yuede, or Tianyi, or the seventh day of the seventh lunar month for compounding. If these rules are followed, the efficacy will be miraculous. Negligence and failure to follow these methods will result in delayed efficacy. Since you revere this medicine, you must be devout.
To prepare this powder for detoxification and resolving sores, mix it with strong vinegar. Apply the root paste to the head of the lesion: apply the round form to the right side and the square form to the left side. The effect should manifest within one shichen (two hours). If severe pain persists, administer another dose. If it still does not subside, add the following prescription:
Xianzhi Genye (Roots and Leaves of *Pseudolarix* / Specific Herb) (1 liang 5 qian total) Zishengsheng (Parasitic Twig of Catalpa) (0.5 liang) Yeming Sha (Guttae Stercoris Cypetini) (1 liang)
Grind the above ingredients according to the previous method, mix thickly, and apply externally. If wind-toxin is extremely severe, add Zhaohouxu (1 liang, known as Baijiangcao in Materia Medica) and Sigua (0.5 liang; fresh is best. In winter, harvest before frost and store; grind into powder for application when needed. Fresh ones should be finely chopped, pounded in a stone mortar, and juiced. One zhan [unit] equals one liang. Do not use vinegar; mix only with juice for better results. This herb also possesses Yin and Yang attributes: long and thin is Yang, short and fat is Yin; they can be used together). For wind-toxin fire-dan resembling boiling liquid splashes, add Yeming Sha (cumulative half liang), Zhen Niuhuang (Real Calculus Bovis, one zi), and Xijiao (Rhinoceros Horn, half qian ground with water, or finely powdered otherwise). Follow the previous method, but do not use vinegar; instead, mix with Sigua juice and water-ground Xijiao for external application.