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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.