（《药性》）
【释名】白龙粉。
时珍曰∶玄，水之色也。明，莹澈也。《御药院方》谓之白龙粉。
【修治】时珍曰∶制法∶用白净朴硝十斤，长流水一石，煎化去滓，星月下露一夜，去
水取硝。每一斗，用萝卜一斤切片，同煮熟滤净，再露一夜取出。每硝一斤，用甘草一两，
同煎去滓，再露一夜取出。以大沙罐一个，筑实盛之，盐泥固济浓半寸，不盖口，置炉中，
以炭火十斤，从文至武 之。待沸定，以瓦一片盖口，仍前固济，再以十五斤顶火 之。放
冷一伏时，取出，隔纸安地上，盆覆三日出火毒，研末。每一斤，入生甘草末一两，炙甘草
末一两，和匀，瓶收用。
【气味】辛、甘，冷，无毒。
【主治】心热烦躁，并五脏宿滞症结（甄权）。明目，退膈上虚热，消肿毒（大明）。
【发明】杲曰∶玄明粉，沉也，阴也。其用有二∶去胃中之实热，荡肠中之宿垢。大抵
用此以代盆硝耳。
《玄明粉传》曰∶唐明皇帝闻终南山道士刘玄真服食多寿，乃诏而问之。玄真曰∶臣按
《仙经》，修炼朴硝，号玄明粉，只服此方，遂无病长生。其药无滓性温，阴中有阳，能除
一百二十种疾。生饵尚能救急难性命，何况修炼长服。益精壮气，助阳证阴。不拘丈夫妇人，
幼稚襁褓。不问四时冷热。一切热毒风冷， 癖气胀满，五劳七伤，骨蒸传尸，头痛烦热，
五内气塞，大小肠不通，三焦热淋，疰忤，咳嗽呕逆，口苦舌干，咽喉闭塞，惊悸健忘，营
卫不调，中酒中 ，饮食过度，腰膝冷痛，手足酸痹，久冷久热，四肢壅塞，背膊拘急，目
昏眩晕，久视无力，肠风痔病，血 不调，妇人产后，小儿疳气，阴毒伤寒，表里疫疠。此
药久服，令人悦泽，开关健脾，驻颜明目，轻身延寿，功效不可具载。但用一两，分为十二
服，临时酌量加减。似觉壅热伤寒，头痛鼻塞，四肢不举，饮食不下，烦闷气胀，须通泻求
安者，即看年纪高下，用药二钱半或半两，以桃花煎汤下为使，最上；次用葱汤下；如未通，
以沸汤投之即效。或食诸鱼藕菜饮食诸毒药，用葱白汤调服二钱，毒物立泄下。若女人身怀
六甲，长服安胎生子，亦无疮肿疾病。若要微畅不闭塞，但长服之，稍稍得力，朝服夕应，
不搜刮人五脏，怡怡自泰。其药初服时，每日空腹，酒饮茶汤任下二钱匕，良久更下三钱匕。
七日内常微泄利黄黑水涎沫等，此是搜淘诸疾根本出去，勿用畏之。七日后渐知腹内暖，消
食下气，长服除故养新，气血日安。用大麻子汤下为使，惟忌苦参。详见《太阴经》中。
好古曰∶玄明粉治阴毒一句，非伏阳在内不可用。若用治真阴毒，杀人甚速。
震亨曰∶玄明粉火 而成，其性当温。曰长服久服，轻身固胎，驻颜益寿，大能补益，
岂理也哉？予亲见一、二朋友，不信予言而亡，故书以为戒。
时珍曰∶《神农本草》言朴硝炼饵服之，轻身神仙，盖方士窜入之言。后人因此制为玄
明粉， 炼多遍，佐以甘草，去其咸寒之毒。遇有三焦肠胃实热积滞，少年气壮者，量与服
之，亦有速效；若脾胃虚冷，及阴虚火动者服之，是速其咎矣。
【附方】新三。
热厥气痛∶玄明粉三钱，热童尿调下。（《集简方》）
伤寒发狂∶玄明粉二钱，朱砂一钱。末之。冷水服。（《伤寒蕴要》）
鼻血不止∶玄明粉二钱，水服。（《圣济》）
（出自《药性论》）
【释名】白龙粉。
李时珍说：玄，是水的颜色；明，是晶莹清澈的样子。《御药院方》称它为白龙粉。
【修治】李时珍说：制作方法：取十斤洁白纯净的朴硝，加入一石长流水，煎煮熔化后去除杂质，在星月之下露天放置一夜，倒掉水分取出硝石。每用一斗硝，加入一斤切片的大萝卜，一同煮熟后过滤干净，再露天放置一夜取出。每用一斤硝，加入一两甘草，一同煎煮去渣，再露天放置一夜取出。用一个大的沙罐，装实盛放，用盐泥将缝隙密封加固半寸厚，不盖盖子，放在炉中，用十斤炭火，从文火逐渐烧到武火。等到沸腾稳定后，用一片瓦盖住罐口，再次用盐泥密封加固，再用十五斤炭火顶火煅烧。冷却一个时辰后取出，隔着一层纸安放在地上，用盆覆盖三天以去除火毒，研磨成粉末。每一斤粉末，加入生甘草末一两、炙甘草末一两，混合均匀，装入瓶中保存使用。
【气味】辛味、甘味，性冷，无毒。
【主治】心热烦躁，以及五脏积滞症结（甄权）。明目，消除膈膜以上的虚热，消肿解毒（孟诜/大明）。
【发明】杲（张元素）说：玄明粉，性质沉降，属阴。它的作用有两个：清除胃中的实热，荡涤肠中的宿便积垢。大体上是用它来代替朴硝罢了。
《玄明粉传》记载：唐明皇听说终南山道士刘玄真服用此物多寿，于是召见他并询问。刘玄真说：臣查阅《仙经》，修炼朴硝，称为玄明粉，只服用这个方子，就能无病长寿。这种药物没有渣滓，性质温和，阴中有阳，能消除一百二十种疾病。生吃尚且能救急难性命，何况经过修炼长期服用。它能益精壮气，助阳证阴。不论男女老少，婴儿幼儿。不问四季冷热。一切热毒风冷，癖气胀满，五劳七伤，骨蒸传尸（结核病），头痛烦热，五脏气机堵塞，大小肠不通，三焦热淋，疰忤（传染病或邪气侵扰），咳嗽呕逆，口苦舌干，咽喉闭塞，惊悸健忘，营卫不调，醉酒中毒，饮食过度，腰膝冷痛，手足酸麻痹痛，久冷久热，四肢壅塞，背膊拘急，目昏眩晕，久视无力，肠风痔病，血气不调，妇人产后，小儿疳气，阴毒伤寒，表里疫疠。此药长期服用，使人面色悦泽，开通关节健脾，驻颜明目，轻身延寿，功效不可尽载。但每次只用一两，分为十二次服用，根据情况酌情加减。如果感觉有壅热伤寒症状，如头痛鼻塞，四肢不能举动，饮食不下，烦闷气胀，需要通泻以求安宁的，就根据年龄高低，用药二钱半或半两，用桃花煎汤送服作为引导，这是最好的方法；其次用葱汤送服；如果仍未通畅，用沸水冲服即见效。或者吃了鱼藕菜等食物及各种毒药，用葱白汤调服二钱，毒物立即泄下。如果女人怀有身孕，长期服用可安胎生子，也不会发生疮肿疾病。如果想要身体微微通畅而不闭塞，只要长期服用，渐渐见效，早晨服用晚上应效，不会搜刮人的五脏，让人怡然自得。此药初次服用时，每天空腹，用酒、茶饮或茶汤任选送服二钱匕，过一会儿再服三钱匕。七日内常会有轻微腹泻，排出黄黑水涎沫等，这是搜淘出各种疾病的根本原因，不要害怕。七日后渐渐感到腹内温暖，消食下气，长期服用能除旧养新，气血日渐安康。用大麻子汤送服作为引导，惟独忌讳苦参。详见《太阴经》中。
好古（王好古）说：玄明粉治疗阴毒一句，如果不是伏阳在内则不可用。如果用治疗真正的阴毒，杀人非常快。
震亨（朱丹溪）说：玄明粉是经过火炼而成的，其性质应当是温的。说长期服用、久服，能轻身固胎，驻颜益寿，大能补益，这符合道理吗？我亲眼见到一两个朋友，不相信我的话而死亡，所以写下来作为警戒。
李时珍说：《神农本草经》说朴硝炼制后服用，能轻身成仙，这大概是方士窜入书中的言论。后人因此制作玄明粉，经过多次炼制，佐以甘草，去掉其咸寒的毒性。遇到有三焦肠胃实热积滞，少年气壮的人，适量给予服用，也有速效；如果是脾胃虚冷，以及阴虚火动的人服用，则是加速灾祸了。
【附方】新收录三方。
(From *Yaoxing Lun*)
[Names] Bailong Fen (White Dragon Powder).
Li Shizhen stated: "Xuan" refers to the color of water; "Ming" means crystal clear. The *Yuyuan Fang* calls it Bailong Fen.
[Preparation] Li Shizhen stated: The preparation method is as follows: Take ten jin of pure white Puxiao (Mirabilite), add one shi of running water, boil until dissolved, and filter out impurities. Expose it overnight under the stars and moon, drain the water, and collect the salt crystals. For every dou of salt crystals, use one jin of sliced radish, cook them together thoroughly, filter cleanly, and expose again overnight before collecting. For every jin of salt crystals, use one liang of Gancao (Licorice Root), decoct together, remove dregs, and expose again overnight before collecting. Place in a large clay pot, pack it tightly, seal the seams thickly with salt mud half an inch deep, leave the mouth uncovered, and place it in a furnace. Use ten jin of charcoal fire, starting from gentle heat to strong heat. When boiling stabilizes, cover the mouth with a tile, reseal with salt mud, and continue roasting with fifteen jin of top-fire. Allow to cool for one shichen (two hours), then take out. Place on the ground covered by paper, and cover with a basin for three days to eliminate fire toxicity. Grind into powder. For every jin of powder, mix in one liang of raw Gancao (Licorice Root) powder and one liang of honey-fried Gancao (Licorice Root) powder evenly. Store in a bottle for use.
[Flavor and Nature] Acrid, sweet, cold, non-toxic.
[Indications] Heart heat with restlessness, and stagnation/syndromes of the five zang organs (Zhen Quan). Brightens the eyes, clears deficiency heat above the diaphragm, reduces swelling and detoxifies (Meng Shen).
[Elucidations] Cao (Zhang Yuansu) said: Xuanming Fen is sinking and yin. It has two functions: clearing excess heat in the stomach and sweeping away old fecal matter in the intestines. Generally, it is used to replace Puxiao (Mirabilite).
The *Xuanming Fen Zhuan* records: Emperor Ming of Tang heard that Liu Xuanzhen, a Daoist priest from Mount Zhongnan, lived long due to its consumption, so he summoned him to ask. Xuanzhen said: According to the *Immortal Scriptures*, refining Puxiao (Mirabilite) yields Xuanming Fen. Only taking this prescription leads to disease-free longevity. This medicine has no residue and is warm in nature, containing yang within yin, capable of curing 120 types of diseases. Raw administration can even save lives in emergencies, let alone refined long-term use. It benefits essence, strengthens qi, assists yang, and harmonizes yin. It applies to men and women, infants and children, regardless of season or temperature. It treats all heat toxins, wind-cold, phlegm-heat distension, five exhaustion and seven injuries, bone-stealing tuberculosis, headache with fever, blockage of internal qi, obstruction of large and small intestines, sanjiao damp-heat strangury, zhuyu (pestilential influences), cough and vomiting, bitter taste and dry tongue, throat obstruction, palpitations and forgetfulness, disharmony of ying and wei, alcohol intoxication, overeating, cold pain in waist and knees, soreness and numbness of limbs, chronic cold or heat, limb congestion, stiffness of back and shoulders, blurred vision and vertigo, weakness after prolonged eye use, intestinal wind and hemorrhoids, blood dyscrasia, postpartum conditions in women, infant malnutrition, yin poison shaoyin syndrome, and epidemic diseases affecting interior and exterior. Long-term use makes one radiant, opens orifices, strengthens spleen, preserves youth, brightens eyes, lightens the body, and extends life; effects are too numerous to record. Usually, one liang is divided into twelve doses, adjusted according to circumstances. If one feels symptoms of heat accumulation or shaoyin syndrome, such as headache, nasal congestion, inability to move limbs, difficulty eating, irritability, and abdominal distension, requiring purgation for relief, dose 2.5 qian or 0.5 liang based on age. Taking it with peach blossom decoction is best; scallion decoction is secondarily effective; if still not unblocked, hot water induces immediate effect. For poisoning from fish, lotus root, vegetables, or other toxic foods, take two qian mixed with scallion white decoction to immediately expel toxins. Pregnant women taking it long-term ensure safe childbirth and prevent sores/diseases. To maintain mild unblockage without constipation, long-term use gradually improves morning intake and evening response without depleting the five zang, bringing peace. Initially, take two qian on an empty stomach with wine, tea, or broth; after a while, take another three qian. Within seven days, slight diarrhea of yellow-black fluid and saliva occurs, indicating the expulsion of disease roots; do not fear. After seven days, warmth is felt in the abdomen, digestion improves, and qi descends. Long-term use eliminates old pathology and nourishes new growth, daily calming qi and blood. Using hemp seed decoction as a guide is recommended; avoid Kushen (Sophora Root). See *Taiyin Jing* for details.
Hao Gu (Wang Haogu) stated: The statement that Xuanming Fen treats yin poison is only applicable when yang is concealed internally. If used for true yin poison, it kills rapidly.
Zhen Heng (Zhu Danxi) said: Xuanming Fen is formed by fire refining, so its nature should be warm. Claims that long-term use lightens the body, secures fetus, preserves youth, and greatly tonify contradict logic? I personally witnessed friends dying because they did not heed my words, so I write this as a warning.
Li Shizhen stated: The *Shennong Bencao Jing* mentions that refined Puxiao (Mirabilite) taken orally makes one light-bodied and immortal; this was likely inserted by alchemists. Later generations made Xuanming Fen from it, refining it multiple times and adding Gancao (Licorice Root) to remove its salty-cold toxicity. For youths with robust constitution suffering from excess heat and stagnation in the sanjiao and intestines, appropriate dosage yields rapid effects; however, for those with spleen-stomach deficiency-cold or yin deficiency with fire hyperactivity, taking it accelerates disaster.
[Attached Prescriptions] Three new prescriptions.
Heat jue with qi pain: Sanqian (3 qian) of Xuanming Fen, mixed with hot child's urine and taken orally. (*Jijian Fang*)
Shaoyin syndrome with mania: Erqian (2 qian) of Xuanming Fen, one qian of Zhusha (Cinnabar). Grind to powder. Take with cold water. (*Shanghan Yunyao*)
Unstopping epistaxis: Erqian (2 qian) of Xuanming Fen, taken with water. (*Shengji Zonglu*)