治香港脚足胫肿痛，憎寒壮热（香港脚自外感得者，山岚雨水，或履湿热之地；自内伤得者，
生冷茶酒油面；湿热之毒，有湿有热，湿又能生热；湿性下流，故注于足；湿热分争，湿胜
则憎
病忌用
不止，
脉驰长
血清燥
防己 木通 槟榔 生地（酒炒） 川芎 白术（炒） 苍术（盐炒） 黄柏（酒炒） 甘
草（
便秘
此足太阳药也。防己行水疗风，泻下焦之湿热；槟榔攻坚利水，坠诸药使下行；木通降
心火
动中
痛也
（东垣）
治湿热相搏，肢节烦痛，肩背沉重；或偏身疼痛；或香港脚肿痛，脚膝生疮，脓水不绝；
及湿热发黄，脉沉实紧数动滑者（湿则肿，热则痛。足膝疮肿，湿热下注也；发黄，湿热薰
蒸脾胃也；香港脚多主水湿，亦有夹风、夹寒之异。湿热胜而为病，或成水 疮，或成赤肿丹
毒，或如疝气攻上引下，均可用此汤损益为治。凡手足前廉属阳明，后廉属太阳，外廉属少
阳，内廉属厥阴，内前廉属太阴，内后廉属少阴。以臂贴身垂下，大指居前，小指居后定之。
手足痛者，当分是何经络，用本经药为引，行其血气则愈∶太阳羌活、防风；阳明升麻、白
芷、
茵陈（酒炒） 羌活 防风 升麻 葛根 苍术 白术 甘草（炙） 黄芩（酒炒） 苦
参（
此足太阳、阳明药也。原文曰∶羌活透关节，防风散留湿，为君。升葛味薄引而上行，
苦以
黄芩
甘草
其留饮，为佐。上下分消其湿，使壅滞得宣通也（《玉机微义》曰∶此方东垣本为治香港脚湿
热之剂
【防己饮】
治疗香港脚（足部肿痛之病）导致的小腿和足胫部位肿胀疼痛，伴有怕冷和高热。
方药组成：防己、木通、槟榔、生地（用酒炒制）、川芎、白术（炒制）、苍术（用盐炒制）、黄柏（用酒炒制）、甘草（炙）。
此方主要作用于足太阳膀胱经。防己能行水利湿以疗风邪，泻除下焦的湿热；槟榔能攻坚破积、利水消肿，引导诸药向下运行；木通能降泄心火……（原文此处有残缺或错简，似夹杂了禁忌症如“病忌用”、“脉驰长”、“血清燥”、“便秘”等描述，以及部分药性解释如“动中”等，依原文结构保留对应位置）。
【当归拈痛汤】（出自李东垣）
治疗湿热相互搏结，导致肢体关节剧烈疼痛，肩背沉重；或者全身偏侧疼痛；或者香港脚肿胀疼痛，脚膝部位生疮，脓水流出不止；以及因湿热导致的发黄，脉象表现为沉、实、紧、数、动、滑者。（注：湿邪致肿，热邪致痛。脚膝处的疮肿，是湿热下注所致；发黄，是湿热熏蒸脾胃所致；香港脚多由水湿引起，也有夹带风邪、寒邪的不同情况。若湿热胜而致病，可形成水疱、赤肿丹毒，或像疝气一样攻冲上下，均可使用此汤加减治疗。凡手足的前缘属阳明经，后缘属太阳经，外缘属少阳经，内缘属厥阴经，内前缘属太阴经，内后缘属少阴经。判定方法为：手臂贴近身体自然下垂，大拇指在前，小指在后，以此定经络。手足疼痛者，应当分辨属于哪条经络，选用本经的药物作为引经药，通行其血气即可痊愈：太阳经用羌活、防风；阳明经用升麻、白芷……）
方药组成：茵陈（用酒炒制）、羌活、防风、升麻、葛根、苍术、白术、甘草（炙）、黄芩（用酒炒制）、苦参（……）。
此方主要作用于足太阳经和足阳明经。原文说：羌活能透达关节，防风能散除滞留的湿气，二者作为君药。升麻、葛根气味轻薄，引导药力上行；苦参……黄芩……甘草……它们能消除留滞的水饮，作为佐使药。上下分消体内的湿气，使壅滞的气机得以宣通。（《玉机微义》记载：此方李东垣原本是用来治疗香港脚湿热的方剂……）
[Fangji Yin]
Treats Hong Kong Jiao (a disease characterized by swelling and pain in the feet and legs) causing swelling and pain in the lower legs and shins, accompanied by aversion to cold and high fever.
Formula Composition: Fangji (Stephaniae Tetrandrae Radix), Mutong (Akebiae Caulis), Binglang (Arecae Semen), Shengdi (Rehmanniae Radix Praeparata per wine-frying), Chuanxiong (Ligustici Chuanxiong Rhizoma), Baizhu (Atractylodis Macrocephalae Rhizoma stir-fried), Cangzhu (Atractylodis Rhizoma stir-fried with salt), Huangbai (Phellodendri Cortex Praeparated per wine-frying), Gancao (Glycyrrhizae Radix et Rhizoma roasted).
This formula primarily acts on the Foot-Taiyang Bladder Meridian. Fangji promotes water metabolism and dispels wind-dampness, draining damp-heat from the Lower Jiao; Binglang breaks up accumulations and promotes diuresis, guiding the actions of other herbs downward; Mutong descends Heart Fire... [Note: The original text contains apparent dislocations or interpolations regarding contraindications such as "contraindicated for certain diseases," "rapid and long pulse," "thin and dry blood," "constipation," and partial pharmacological explanations like "moving within the middle." These are retained in their respective positions according to the source structure.]
[Danggui Niantong Tang] (Attributed to Li Dongyuan)
Treats conditions where damp-heat intertwines, causing severe pain in the limbs and joints, heaviness in the shoulders and back; or pain on one side of the body; or Hong Kong Jiao with swelling and pain, sores on the feet and knees with continuous purulent discharge; as well as jaundice caused by damp-heat, with a pulse that is deep, excess, tight, rapid, moving, or slippery. (Note: Dampness causes swelling, heat causes pain. Sores and swelling on the feet and knees result from damp-heat sinking downward; jaundice results from damp-heat steaming the Spleen and Stomach. Hong Kong Jiao is mostly due to water-dampness, but may also involve wind or cold. If damp-heat prevails and causes disease, it may manifest as vesicles, red swollen carbuncles, or colic-like pain attacking upwards and downwards. This decoction can be used with modifications for treatment. Regarding meridians: the anterior aspect of the hands and feet belongs to the Yangming Meridian, the posterior aspect to the Taiyang Meridian, the lateral aspect to the Shaoyang Meridian, the medial aspect to the Jueyin Meridian, the anteromedial aspect to the Taiyin Meridian, and the posteromedial aspect to the Shaoyin Meridian. To determine this, let the arms hang naturally by the sides close to the body; the thumb is anterior, and the little finger is posterior. For pain in the hands and feet, one must distinguish which meridian is involved and use herbs of that specific meridian as guiding agents to promote the flow of Qi and Blood for recovery: Taiyang uses Qianghuo and Fangfeng; Yangming uses Shengma and Baizhi...)
Formula Composition: Yinchén (Artemisiae Scopariae Herba Praeparated per wine-frying), Qianghuo (Notopterygii Rhizoma et Radix), Fangfeng (Saposhnikoviae Radix), Shengma (Cimicifugae Rhizoma), Gegen (Puerariae Lobatae Radix), Cangzhu (Atractylodis Rhizoma), Baizhu (Atractylodis Macrocephalae Rhizoma), Gancao (Glycyrrhizae Radix et Rhizoma roasted), Huangqin (Scutellariae Radix Praeparated per wine-frying), Kushen (Sophorae Flavescentis Radix)...
This formula primarily acts on the Foot-Taiyang and Foot-Yangming Meridians. The original text states: Qianghuo penetrates the joints, and Fangfeng disperses retained dampness; they serve as the Sovereign (Jun) herbs. Shengma and Gegen have light aromas and guide the medicinal action upward; Kushen... Huangqin... Gancao... They eliminate retained fluid retention, serving as Assistant (Zuo) and Envoy (Shi) herbs. They dissipate dampness from both above and below, allowing stagnant Qi to become unblocked and free. (The *Yuji Wei Yi* records: This formula was originally created by Li Dongyuan to treat damp-heat in Hong Kong Jiao...)