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Treatment for edema with extremely scanty urination.
Earthworm (Longdan), Polyporus (Zuling, peeled), and Needle Sand (Zhensha) [each one tael].
Grind the above ingredients into a fine powder, mix with scallion juice to form a paste, apply to the umbilicus (navel), approximately one cun in height and width, secure with silk cloth. The treatment is considered effective when urine output increases; change the application twice daily.

Jiawei Shengqi Wan (Modified Kidney Qi Pill): Treats heaviness of the waist and legs due to Kidney deficiency, accompanied by difficult or insufficient urination.
Prepared Aconite Root (Fuzi, processed, two taels), White Poria (Baifuling, peeled), Alisma Rhizome (Zexie), Cornus Fruit (Shanzhuyu, flesh only), Prepared Yam (Shanyao, stir-fried), Plantago Seed (Cheqianzi, steamed with wine), Moutan Bark (Mudanpi, woody core removed, each one tael), Cinnamon Twig (Guigui, not exposed to direct fire), Cyathula Root (Chuanniuxi, rhizome removed, soaked in wine), Prepared Rehmannia Root (Shudihuang, each half tael).
Grind the above ingredients into a fine powder, bind with refined honey to make pills the size of paulownia seeds. Take seventy pills per dose, on an empty stomach, washed down with rice water.

Medical texts record several types of Gu poison (parasitic disease caused by venomous insects/snakes). These are manufactured by people in the mountainous regions of Fujian. They place various insects and snakes in vessels, allowing them to devour each other until only one survives; this survivor is called "Gu." Its venom is extracted into wine, which can harm humans. Upon poisoning, it causes severe colic in the heart and abdomen, as if being bitten; vomit and excrement resemble rotting meat. If not treated immediately, it corrodes the five Zang organs, leading to death. However, this disease has acute and chronic forms. Acute cases may result in death within ten days, while chronic cases drag on for years, with the pathogen wandering inside the abdomen, causing physical debility, heavy joints, and upon onset, heart pain and irritability. Furthermore, food consumed by the patient transforms into Gu, gradually eroding the Zang and Fu organs until death occurs. After death, the pathogen spreads, infecting others, thus forming "Gu Zhu" (infectious Gu transmission). To verify: ask the patient to spit into water; if it sinks, it is Gu poison; if it floats, it is not. Alternatively, have the patient hold a soybean in the mouth; if the bean swells and its skin peels off, it is Gu poison; if it does not rot or peel, it is not. Place goose feathers under the patient's bed without their knowledge; if the condition worsens, it is a Gu disease; if not, it is not. Treatment must not follow the protocols for other diseases but requires careful examination. Ancients used burnt remains of old drum skins, taken as a square-inch measure with rice water. Shortly after ingestion, the patient will spontaneously call out the name of the person who made the Gu; summoning that person leads to recovery. Anyone poisoned by Gu will find that chewing raw black beans lacks their usual fishy smell.