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Leech (Shuizhi, Hirudo) (20 pieces, processed by stir-frying)
Housefly larva (Mengchong, Ophrya) (25 pieces, wings and feet removed, processed by stir-frying)
Peach kernel (Taoren, Persicae Semen) (20 pieces, skin and tips removed)
Rhubarb root (Dahuang, Rheum palmatum) (3 liang)
The above four ingredients. Pound into powder, divide into four pills. Boil one pill in one sheng of water. Obtain seven ge of decoction. When taking the medicine, blood stasis should be discharged naturally. If not discharged, take again.

Although it is the same as Didang Tang, changing it to a pill has profound significance. The Classics state: In cold damage with fever, if the lower abdomen is full, urination should be difficult; now that it is actually free, this indicates blood stasis. It should be purged, and Didang Wan is suitable. Since the disease originates from cold damage, cold tends to cause coagulation and stagnation, so blood clumps are difficult to dissipate. Therefore, boiling the medicine and taking it with the dregs allows the tangible substance to linger at the site of blood stasis, jointly driving it out. This differs from tangs that focus solely on scouring and cleansing.

Genkwa flower (Yuanhua, Daphne genkwa) (processed by stir-frying)
Kansui root (Gansui, Kansui radix)
Kerria root (Daji, Euphorbia lathyris)
Jujube fruit (Dazao, Ziziphus jujuba) (10 pieces, split open)
The above three ingredients in equal parts. Each is separately pounded into powder. Use one and a half sheng of water to first boil ten large jujubes. Obtain eight ge of liquid, remove dregs, and add the medicinal powders. Strong individuals take one qianbi; frail individuals take half a qianbi. Take warm. Take on an empty stomach in the morning. If defecation is scant and the disease remains, take again the next day, increasing the dose by half a qianbi. After obtaining free diarrhea, nourish oneself with millet porridge.

In Taiyang wind-stroke syndrome, accompanied by diarrhea and vomiting/rebellious qi, only after the exterior syndrome is resolved can interior attack be performed. If the patient sweats, attacks occur at specific times, has headache, epigastric oppression, hardness and fullness radiating to the hypochondrium, dry retching, shortness of breath, sweating without aversion to cold, this indicates the exterior is resolved but the interior is disharmonious. Shizao Tang is the primary treatment. Note: Diarrhea and vomiting clearly indicate water pathogen pathology. However, since the disease stems from Taiyang wind-stroke, the exterior must be resolved before attacking. Sweating resembles an exterior syndrome, but since it occurs at intervals and lacks aversion to cold, it is not an exterior syndrome. Headache resembles an exterior syndrome, but sweating without aversion to cold indicates it is not an exterior syndrome. The symptoms of epigastric oppression, hardness/fullness radiating to the hypochondrium, dry retching, and shortness of breath are all signs of internal water pathogen congestion. Thus, sweating belongs to water vapor steaming externally, and headache belongs to water pathogen counterflow upward. Treatment focuses on the interior rather than the exterior; when the interior is disharmonious, purging is appropriate. However, the pathogen is in the chest and hypochondrium, differing from methods for purging Stomach excess. Stomach excess involves pathogen seizing fluids, resulting in fluid deficiency; this condition involves pathogen binding in the chest/hypochondrium, resulting in excessive water. Using drugs that scour the intestines and stomach would punish the innocent and cause adverse transformations. Therefore, Yuanhua, Gansui, and Daji are used, all harsh water-draining herbs, separately pounded into powder, while Jujube decoction is used to carry the medicine to the highest regions due to its sweet flavor, dispersing and draining water pathogens from top to bottom. This method is feared and unused by many today; how could they know that without this, how can water pathogens be purged?