（毒草）大泻脏腑水湿
大戟（专入肺肾。旁行经络。）气味苦寒。性秉纯阳。峻利居首。上泻肺气。下泄肾水。
兼因
味辛。旁行经脉。无处不到。浸水色绿。又入肝胆。故书皆载能治十二水毒。蛊结腹满急痛
等症。（好古曰。大戟与甘遂同为泄水之药。湿胜者苦燥除之也。）李时珍云。凡痰涎为物。
随气升降。无处不到。入于心则迷窍而癫痫。入于肺则窍塞而成咳唾稠粘。喘急背冷。入于
肝则留伏蓄聚。而成胁痛干呕。寒热往来。入于经络则麻痹疼痛。入于筋骨则颈项胸背腰胁
手足牵引隐痛。三因并以控涎丹主之。盖有大戟能泄脏腑之水湿。甘遂能行经隧之水湿。白
芥子能散皮里膜外之痰气。要必实症实热实脉。方可以用。（非实莫用。）否则泻肺伤肾。害
人不浅。（李时珍曰。愚按百祥惟用大戟一味。百祥独泻腑。正实则泻其子也。肾邪实而泻
其
肝也。洁古老人治痘变黑归肾症。用宣风散代百祥膏。亦是泻子之意。盖毒胜火炽则水益涸
。风挟火势则土受亏。故津血内竭不能化脓而成青黑干陷之症。泻其风火之毒。所以救肾扶
脾也。）若中其毒者。惟菖蒲可解。杭产色紫者良。北产色白者不堪入药。水浆煮。去骨用
。得大枣则不损脾。畏菖蒲。反甘草。苗名泽漆。亦行水道。主治略同。
[Poisonous Herb] Drastically Purges Water-Dampness from the Zang-Fu Organs
Da Ji (Euphorbiae Pekinensis Radix) [specifically enters the Lung and Kidney meridians, and extends laterally to the collaterals.] Its flavor is bitter and cold. Its nature embodies pure Yang. It ranks first in its drastic purgative and diuretic properties. It drains Lung Qi upwards and expels Kidney water downwards.
Additionally,
due to its pungent flavor, it travels laterally through the meridians, reaching everywhere. When soaked, the water turns green, indicating its entry into the Liver and Gallbladder. Therefore, medical texts record that it can treat twelve types of water-toxins, Gu accumulation, abdominal distension, and urgent pain
and other symptoms. (Li Haogu stated: Da Ji and Gan Sui are both herbs for draining water; they remove dampness excess through their bitter-drying nature.) Li Shizhen said: Phlegm-fluids, as a pathogenic factor,
ascend and descend with Qi, reaching nowhere without access. Entering the Heart, it clouds the orifices leading to epilepsy; entering the Lungs, it obstructs the airways causing coughing with thick sticky sputum, panting, urgency, and coldness in the back; entering the
Liver, it lingers, hides, and accumulates, causing hypochondriac pain, dry heaving, alternating chills and fever; entering the meridians, it causes numbness and pain; entering the sinews and bones, it causes pulling and hidden pain in the neck, chest, back, waist, flanks,
hands, and feet. These three categories of etiologies are all primarily treated with Kong Xian Dan. This is because Da Ji can drain water-dampness from the Zang-Fu organs, Gan Sui can circulate water-dampness through the vessel tunnels, and Bai Jie Zi can dissipate phlegm-Qi within the skin and membranes. One must ensure the presence of Excess syndrome, Excess-heat, and an Excess pulse before use. (Do not use if not Excess.) Otherwise, it will drain Lung Qi and injure the Kidney,
causing significant harm to people. (Li Shizhen said: In my observation, Bai Xiang Gao uses only Da Ji as a single ingredient. Bai Xiang Gao exclusively purges Fu-organ pathogens, which aligns with the principle of "draining the son when there is excess." For Kidney pathogen excess, one drains the
Liver. The elder Zhang Jiegu treated acneiform eruptions turning black and returning to the Kidney using Xuan Feng San instead of Bai Xiang Gao, which also reflects the intention of draining the son. Generally, when toxins prevail and fire blazes, water becomes increasingly depleted.
When wind carries the fire's force, Earth suffers deficiency. Thus, internal depletion of fluids and blood prevents pus formation, resulting in cyanotic-black, dry, and sunken lesions. Draining the wind-fire toxins thereby saves the Kidney and supports the Spleen.) If one is poisoned by it, only Chang Pu (Acori Tatarinowii Rhizoma) can resolve the toxicity. Those produced in Hangzhou with a purple color are superior. Those produced in the North with a white color are unsuitable for medicinal use. Boil in water and grain beverages, discard the core/bone, and use the remainder.
It does not damage the Spleen when taken with Da Zao (Jujubae Fructus). It fears Chang Pu. It is incompatible with Gan Cao (Glycyrrhizae Radix et Rhizoma). The herbaceous name is Ze Qi (Phytolaccae Radix), which also promotes water pathways. Its main indications are slightly similar.