治暑毒入心，发热大渴，烦躁便秘，邪在上焦而治在下焦者，使浊阴出下窍而清阳
之上焦者，自能宣化矣。心邪不从心泻，盖脏无泻法，脏实而泻其腑也。通治诸湿，腹
满水饮水肿，呕逆泄泻，水寒射肺，或喘或咳，中暑烦褐，身热头痛，膀胱积热，便秘
而渴，霍乱吐泻，痰饮湿疟，身痛身重，此皆伤湿之见症也。湿胜则脾不运土不能治
水，溢于皮肤则肿胀，并于大肠则泄泻，水停心下则呕逆，水寒射肺则喘咳，暑先入心
故烦渴，肺病则金不能生水，膀胱热则阳不化阴，故便秘而渴，阴阳不利则霍乱吐泻，
湿胜则身痛身重，总之，下不通利则阴阳不能升降而变症多矣。且功专荡热滋燥，导饮
生津，故亦为消痞良方。
猪苓 白茯苓 白术（炒） 泽泻 桂 为末，每服三钱，服后多饮热水，汗出
而愈。
此足太阳药也。太阳之热，传入膀胱，故口渴而便不通。《经》曰∶淡味渗泄为阳，
故用二苓甘淡入肺，而通膀胱为君。水无当于五味，故淡能利水，茯苓走气分，猪苓走
血分，然必上行入肺而后能下降入膀胱也。咸味涌泄为阴，泽泻甘咸入肾，同利水道为
臣。益土所以制水，故以白术苦温，健脾去湿为佐。然膀胱虽藏津液，必由气化而始能
出，故用肉桂辛热为使。热因热用，引入膀胱，以化其气，使湿热之气，皆从小便而出
也。若汗下之后，内亡津液而便不利者，不可用之，恐重亡津液而益亏其阴也。然治秘
之道有三∶一曰肺燥不能化气，故用二苓泽泻之甘淡，以泻肺而降气。一曰脾湿不能升
精渗浊，故用白术之苦温以燥脾而升精。一曰膀胱无阳不能化气，故用肉桂之辛热，以
温膀胱而化阴，使水道通利，则上可以止渴，中可以去湿，下可以泻邪热也。然五苓
利水，何以复能止渴生津？盖湿热壅于中焦则气不得施化，故津竭而小便不通也。用五
苓以利去湿热则浊降清升，而脾能为胃行其津液、故津回而渴止矣。
治疗暑热毒邪侵入心脏，出现发热、极度口渴、烦躁不安、大便秘结的症状。这是病邪位于上焦却从下焦进行治疗的方法，通过使浊阴之气从下窍排出，从而使清阳之气在上焦得以宣通化生。心经的邪气不从心脏直接泻除，因为五脏没有直接的泻法，而是通过泻其相表里的腑（小肠）来治疗。
此方通用治疗各种湿邪为患，如腹部胀满、饮水后水肿、呕吐逆气、腹泻、寒水射肺导致的喘息或咳嗽、中暑引起的烦闷褐色汗出、身体发热头痛、膀胱积热导致的大便秘结且口渴、霍乱引起的吐泻、痰饮、湿疟疾、身体疼痛沉重等，这些都是伤湿的表现症状。湿气过盛则脾运化功能失常，土不能制约水，水溢于皮肤则导致肿胀，并入大肠则导致泄泻；水停聚在心下则引起呕吐逆气；寒水射肺则导致喘咳；暑邪先入心故见烦渴；肺病则金不能生水；膀胱有热则阳气不能化阴，所以大便秘结且口渴；阴阳之气不利则导致霍乱吐泻；湿气过盛则身体疼痛沉重。总之，如果下部不通利，则阴阳之气不能升降，从而产生多种变症。而且本方功效专于荡涤热邪、滋润燥热、引导饮邪、生津液，因此也是消除痞块的良方。
猪苓、白茯苓、炒白术、泽泻、桂枝。将上述药材研为细末，每次服用三钱，服药后多喝热水，待出汗后即可痊愈。
本方是足太阳膀胱经的药物。太阳经的热邪传入膀胱，所以出现口渴且大便不通。《内经》说：淡味的药物具有渗泄作用，属于阳。所以用猪苓、茯苓味甘淡而入肺，进而通利膀胱，作为君药。水与五味无直接对应关系，但淡味能利水。茯苓行走在气分，猪苓行走在血分，然而必须上行入肺后才能下降入膀胱。咸味的药物具有涌泄作用，属于阴。泽泻味甘咸而入肾，共同利水道，作为臣药。培补脾胃土以制约水湿，所以用白术味苦温，健脾祛湿，作为佐药。然而膀胱虽然贮藏津液，但必须经过气化作用才能排出，所以用肉桂味辛热作为使药。采用“热因热用”的方法，引入膀胱以化气，使湿热之气都从小便排出。如果在发汗或攻下之后，体内津液亏损导致小便不利者，不可使用此方，恐怕会进一步损伤津液而更加亏虚阴液。然而治疗便秘的方法有三种：一是肺燥不能化气，所以用猪苓、茯苓、泽泻的甘淡之性，以泻肺而降气；二是脾湿不能升清降浊，所以用白术的苦温之性以燥脾而升清；三是膀胱无阳气不能化气，所以用肉桂的辛热之性，以温膀胱而化阴，使水道通利，这样向上可以止渴，中间可以去湿，向下可以泻除邪热。然而五苓散利水，为什么又能止渴生津？这是因为湿热壅滞于中焦，导致气机不能施化，所以津液枯竭且小便不通。使用五苓散以利去湿热，则浊气下降清气上升，脾能为胃传输津液，所以津液恢复而口渴停止。
Treats summerheat-toxin invading the Heart, presenting with fever, extreme thirst, restlessness, and constipation. This is a case where the pathogenic factor is in the Upper Jiao (Upper Burner), yet treatment is directed at the Lower Jiao (Lower Burner). By allowing turbid Yin to exit through the lower orifices, the clear Yang in the Upper Jiao can naturally be disseminated and transformed. Pathogens in the Heart do not drain directly from the Heart organ itself, as there is no direct draining method for Zang organs; instead, one drains its paired Fu organ (the Small Intestine) when the Zang is full.
This formula broadly treats various dampness disorders: abdominal distension, edema after drinking water, vomiting and regurgitation, diarrhea, cold-water attacking the Lung causing wheezing or coughing, summerheat causing irritability and brownish sweat, body heat and headache, bladder accumulation of heat causing constipation and thirst, cholera with vomiting and diarrhea, phlegm-fluid retention, damp-malaria, body pain and heaviness. These are all manifestations of injury by dampness. When dampness prevails, the Spleen fails to transport, Earth fails to control Water, leading to overflow into the skin causing swelling, or entering the Large Intestine causing diarrhea. Water stagnating below the Heart causes vomiting and regurgitation; cold-water attacking the Lung causes wheezing and coughing. Summerheat enters the Heart first, hence irritability and thirst. Lung disease means Metal cannot generate Water; bladder heat means Yang cannot transform Yin, hence constipation and thirst. Disharmony of Yin and Yang leads to cholera with vomiting and diarrhea; prevailing dampness leads to body pain and heaviness. In summary, if the lower pathways are not unobstructed, the ascending and descending of Yin and Yang Qi will fail, resulting in many complicated symptoms. Furthermore, its function specializes in sweeping away heat, moistening dryness, guiding out fluid retention, and generating fluids, making it an excellent formula for eliminating痞 (fullness/lump).
Zhu Ling (Polypori Umbellati Sclerotium), Bai Fu Ling (Poria), Chao Bai Zhu (Stir-fried Atractylodis Macrocephalae Rhizoma), Ze Xie (Alismatis Rhizoma), Gui Zhi (Cinnamomi Ramulus). Grind into powder. Take 3 qian per dose. After taking the medicine, drink plenty of hot water. Recovery occurs upon sweating.
This belongs to the Foot-Taiyang (Bladder Meridian) category. Heat from Taiyang transmits into the Bladder, causing thirst and urinary/fecal obstruction. The Classic states: "Bland flavors promote seepage and discharge, belonging to Yang." Therefore, Zhu Ling and Fu Ling, being bland and sweet, enter the Lung and communicate with the Bladder, serving as the Sovereign (Jun) herbs. Water has no specific correspondence among the five flavors, but blandness promotes diuresis. Fu Ling moves in the Qi level, while Zhu Ling moves in the Blood level; however, they must ascend to the Lung before they can descend to the Bladder. "Salty flavors induce vomiting and discharge, belonging to Yin." Ze Xie, being sweet and salty, enters the Kidney and jointly promotes water passage, serving as the Minister (Chen) herb. Strengthening Earth controls Water; thus, Bai Zhu, bitter and warm, strengthens the Spleen and removes dampness, serving as the Assistant (Zuo) herb. Although the Bladder stores Jin-Ye (body fluids), it requires Qi transformation to excrete them. Therefore, Rou Gui (Cinnamomi Cortex) is used as the Envoy (Shi) herb due to its acrid and hot nature. Using heat to treat heat (reversal therapy), it guides the action into the Bladder to transform Qi, ensuring that damp-heat exits via urination. If after sweating or purging, internal loss of Jin-Ye leads to difficult urination, this formula should not be used, lest it further deplete Jin-Ye and exacerbate Yin deficiency.
There are three approaches to treating constipation/obstruction:
1. Lung dryness failing to transform Qi: Use the bland sweetness of Zhu Ling, Fu Ling, and Ze Xie to drain the Lung and descend Qi.
2. Spleen dampness failing to raise the clear and separate the turbid: Use the bitter warmth of Bai Zhu to dry the Spleen and raise the clear essence.
3. Bladder lacking Yang to transform Qi: Use the acrid heat of Rou Gui to warm the Bladder and transform Yin, unblocking the water passages. Thus, upward it stops thirst, centrally it removes dampness, and downward it drains pathogenic heat.
However, why does Wu Ling San (Five-Ingredient Powder with Poria), which promotes urination, also stop thirst and generate fluids? Because damp-heat congestion in the Middle Jiao prevents Qi from functioning normally, leading to exhaustion of Jin-Ye and urinary obstruction. Using Wu Ling San to drain damp-heat allows turbidity to descend and clarity to ascend. The Spleen can then transport Jin-Ye for the Stomach, restoring Jin-Ye and stopping thirst.