桑枝一小升，细切炒香，以水三大升，煎取二升，一日服尽无时。
诸痛风者，服此方良。
《图经》云∶桑枝性平，不冷不热，可以常服。疗中风体痒，干湿香港脚，及风气四肢拘
挛，上气眼昏，肺气嗽，消食，利小便；久服轻身，聪明耳目，令人光泽，兼疗口干。《抱
朴子仙经》云∶一切仙药，不得桑枝煎不服。许学士云∶政和间，予尝病两臂痛，服诸药不
效，根据此作数剂，臂痛寻愈。
叙曰∶疠风一证，古今难之，是以斯世之妄治者多也。深达疠风之奥者，洁古、东垣二
人而已，余皆未有言也。今考古人之方六首，庶几乎精练之奇哉！
苦参（四两，为末） 土蝮蛇 白花蛇 乌梢蛇（头尾全者，各一条，酒浸二三日，去
骨，阴干为末） 皂角（五斤，去皮弦，以无灰酒浸一宿，取出用水熬膏）
上以苦参、蝮蛇、白花、乌梢四味为末，将皂角膏和丸，如梧桐子大。每服七十丸，以
玉屏风散煎汤吞下。轻者三蛇得一即效，不必全也。
疠风，手足麻木，毛落眉脱，遍身癞疹，搔痒成疮者，此方主之。
疠风者，天地杀物之风，燥金之气也，故令疮而不脓，燥而不湿。燥金之体涩，故一客
于人，则营卫之行滞，令人不仁而麻木也。毛落眉脱者，燥风伐其营卫，而表气不固也。遍
身癞疹者，上气下血俱病也。诸痛属实，诸痒属虚，疠风之痒，固多有虫，而卫气之虚，不
可诬也。是证也，主燥剂以疏风，则反以助邪，往往血枯而死，故求古方之润剂以主之。白
花、乌梢、土蝮三蛇者，血气之属也，用血气之属以驱风，岂不油然而润乎？然其性中有毒，
同气相求，直达疠风毒舍之处，岂不居然而效乎？皂角之性，善于洁身，则亦可以洁病。苦
参之性，善于去热，则亦可以去风。昔人吞以防风通圣散，此方乃汗下之剂也，非营卫虚者
所宜，今以玉屏风散更之，则黄 可以排脓补表，防风可以利气疏邪，白术可以实脾而补肌
矣。
桑枝一小升，细细切碎后炒至香气溢出，用三升水煎煮，取药液二升，在一日内分次服完，不拘具体时间。
各种痛风患者，服用此方效果良好。
《本草图经》记载：桑枝性味平和，不寒不热，可以长期服用。治疗中风引起的身体瘙痒、干性或湿性脚气（香港脚），以及风气导致的四肢拘挛、气逆上冲、眼睛昏花、肺气咳嗽，还能帮助消化、通利小便；长期服用可使身体轻盈，耳目聪明，使人面色光泽，兼治口干。《抱朴子仙经》说：所有的仙药，如果不配合桑枝煎剂服用，就不算有效。许学士说：政和年间，我曾患双臂疼痛，服用多种药物无效，依照此方制作了几剂，手臂疼痛随即痊愈。
序言说：疠风这一病症，古今医家都感到棘手，因此世上胡乱治疗的人很多。真正深入理解疠风奥秘的，只有洁古先生和东垣先生两人罢了，其他人都没有发表过相关论述。现在考证古代人的六个方子，大概算是精纯精炼的奇方了！
苦参（四两，研成粉末） 土蝮蛇 白花蛇 乌梢蛇（头尾完整的各一条，用酒浸泡两三天，去掉骨头，阴干后研成粉末） 皂角（五斤，去掉皮和筋络，用无灰酒浸泡一夜，取出用水熬制成膏）
以上将苦参、蝮蛇、白花蛇、乌梢蛇这四味药研成粉末，用皂角膏调和制成丸药，大小如梧桐子。每次服用七十丸，用玉屏风散煎汤送服。病情轻的，使用三种蛇中的一种就能见效，不必全部使用。
对于疠风，出现手足麻木、毛发脱落眉毛稀疏、全身癞疹、搔抓后成疮的症状者，此方主治。
所谓疠风，是天地间杀伤万物的风，属于燥金之气，所以导致疮疡化脓少而不流脓，干燥而不湿润。燥金的性质涩滞，一旦侵入人体，就会使营卫运行阻滞，导致肢体失去知觉而麻木。毛发脱落眉毛稀疏，是因为燥风损伤了营卫，导致体表之气不固。全身癞疹，是因为气逆于上、血病于下同时发病。一般来说，各种疼痛属于实证，各种瘙痒属于虚证，疠风的瘙痒固然多由虫邪引起，但卫气的虚弱也是不可否认的。这种病症，如果用燥烈的药物来疏风，反而会助长邪气，往往导致血液枯竭而死，所以寻求古代的润剂方子来主治。白花蛇、乌梢蛇、土蝮蛇这三种蛇，属于血肉有情之品，用血肉有情之品来驱除风邪，难道不是自然而然地滋润吗？然而它们的性质中含有毒性，同气相求，能直达疠风毒邪潜伏之处，难道不是立刻见效吗？皂角的性质善于清洁身体，那么也可以用来清洁病邪。苦参的性质善于清热，那么也可以用来祛风。过去有人服用防风通圣散，这是一个汗下并用的方子，不适合营卫虚弱的人，现在用玉屏风散替代它，那么黄芪可以排脓补益表气，防风可以利气疏散邪气，白术可以健脾充实肌肉。
A small sheng (approx. 200ml) of mulberry twig, finely chopped and stir-fried until fragrant, is decocted with three sheng (approx. 600ml) of water to obtain two sheng (approx. 400ml) of liquid. It should be consumed throughout the day without specific timing.
This prescription is effective for various types of gout (tongfeng).
The *Bencao Tujing* (Illustrated Materia Medica) states: Mulberry twig has a neutral nature, neither cold nor hot, and can be taken regularly. It treats body itching caused by wind-stroke, dry or damp jiaoxi (podagra/foot qi), limb spasms and contractures due to wind-pathogens, upward rushing of qi, blurred vision, pulmonary cough, aids digestion, promotes urination; long-term use makes the body light, sharpens hearing and vision, enhances complexion, and relieves dry mouth. The *Baopuzi Xianjing* (Immortal Classic of Baopu Zi) says: All immortal herbs are ineffective unless taken with mulberry twig decoction. Scholar Xu stated: During the Zhenghe era, I suffered from pain in both arms. After taking various medicines without effect, I prepared several doses according to this prescription, and the arm pain soon healed.
Preface: The syndrome of Leprosy (lifeng) has been difficult for physicians since ancient times to the present, hence there are many who treat it recklessly in this world. Only Jiegu (Li Dongyuan's teacher, Zhang Congzheng's contemporary, actually Li Gao refers to Zhang Congzheng as Jiegu? No, Jiegu is Zhang Congzheng, Dongyuan is Li Gao. Wait, Jiegu is Zhang Congzheng. Dongyuan is Li Gao. The text says "Jiegu, Dongyuan". Zhang Congzheng is styled Jiegu. Li Gao is styled Dongyuan.) and Dongyuan (Li Gao) have deeply understood the mysteries of lifeng; others have not spoken on it. Now, examining six prescriptions from ancients, these are perhaps the exquisite and rare refined formulas!
Sophora root (Kushen) (4 liang, ground into powder) Earth pit viper (Tufushe) White flower snake (Baihuashe) Black-headed snake (Wushaoshe) (One each, complete head and tail, soaked in wine for 2-3 days, bones removed, dried in shade and ground into powder) Soap pod (Zaojiao) (5 jin, skin and strings removed, soaked in non-ashy wine overnight, taken out and boiled with water to make paste)
Grind the above four ingredients—Kushen, Fusu, Baihua, Wushao—into powder. Mix with the Zaojiao paste to form pills the size of sophora seeds. Take 70 pills per dose, swallowed with the decoction of Yupingfeng San (Jade Windscreen Powder). For mild cases, using one of the three snakes is sufficient for efficacy; all are not necessary.
For lifeng (leprosy/hansen's disease) presenting with numbness in hands and feet, hair loss including eyebrows, generalized lepromatous rashes, and sores formed by scratching, this formula is indicated.
Lifeng is the wind that kills things between heaven and earth, belonging to the Qi of Dry Metal. Thus, it causes ulcers that do not suppurate and conditions that are dry rather than damp. The nature of Dry Metal is astringent/stagnant; once it invades a person, the circulation of Ying (Nutritive) and Wei (Defensive) Qi becomes stagnant, leading to insensitivity and numbness. Hair loss and eyebrow shedding occur because the dry wind damages Ying and Wei, causing the exterior Qi to be insecure. Generalized lepromatous rashes indicate simultaneous pathology of Qi rising and Blood being diseased. Generally, pain belongs to Excess, while itching belongs to Deficiency. Although the itching of lifeng is often due to parasites, the deficiency of Wei Qi cannot be denied. In this syndrome, using drying agents to disperse wind would counterproductively assist the pathogen, often leading to death from blood exhaustion. Therefore, we seek ancient moistening formulas to treat it. The white flower snake, black-headed snake, and earth pit viper belong to the category of blood and qi (flesh-and-blood sentient beings). Using such substances to drive out wind naturally provides moisture. However, they contain toxicity; through the principle of "like attracts like," they reach directly to the abode of the lifeng toxin, ensuring immediate efficacy. The nature of soap pods is good at cleansing the body, thus it can also cleanse the disease. The nature of Sophora root is good at clearing heat, thus it can also dispel wind. In the past, people took Fangfeng Tongsheng San, which is a formula inducing sweating and purging, unsuitable for those with deficient Ying and Wei. Now, replacing it with Yupingfeng San, Huangqi (Astragalus) can drain pus and tonify the exterior, Fangfeng (Saposhnikovia) can promote Qi flow and disperse pathogens, and Baizhu (Atractylodes) can solidify the Spleen and tonify muscles.