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Bupleuri Radix (Chaihu) 8 liang, Cinnamomi Ramulus (Guizhi) 3 liang (bark removed), Zingiberis Rhizoma Recens (Ganjiang) 2 liang, Scutellariae Radix (Huangqin) 3 liang, Tetrastigomatis Radix et Caulis (Gualougen) 4 liang, Ostreae Concha (Muli) 3 liang (calcined), Glycyrrhizae Radix et Rhizoma (Gancao) 2 liang.
The above seven herbs are decocted in 12 sheng of water until reduced to 6 sheng. The dregs are strained out, and the liquid is further concentrated by boiling until 3 sheng remain. Take 1 sheng warm, three times a day. Mild irritability may occur after the first dose.

In summer, pathogenic heat (Shu-xie) first damages the latent Yin within the body; in autumn, exposure to cool wind further injures the Defensive Yang (Wei-yang). This results in malaria with predominant chills and slight fever, indicating that there is no intense struggle between Yin and Yang.
Chaihu Tang (Chaihu Tang, Bupleurum Decoction) is used... [Text fragment]

Dichroae Radix (Changshan) 1 qian, Arecae Semen (Binglang) 2 qian, Tsaoko Fructus (Caoguo) 1 qian, Magnoliae Officinalis Cortex (Houpo) 1 qian, Scutellariae Radix (Huangqin) 1.5 qian, Anemarrhenae Rhizoma (Zhimu) 2 qian, Acori Tatarinowii Rhizoma (Shichangpu) 0.7 qian, Citri Reticulatae Pericarpium Viride (Qingpi)... [Text fragment].
Decoct the above herbs in two zhong of water until reduced to eight parts. Leave exposed overnight. Take warm after the malaria attack subsides.

For malaria occurring every other day, the *Neijing* states: "Pathogenic factors invade internally towards the five Zang organs and extend horizontally to connect with the Mu-Yuan (Mo-Yuan)" (In Quan Yuanqi's edition, "Mu" is written as "Mo"). The pathway is distant... [Text fragment] *Shengji Zonglu*... Exterior syndrome... [Text fragment] Stomach...
Houpo (Magnoliae Officinalis Cortex) warms and disperses turbid pathogens in the intestines and stomach; Huangqin (Scutellariae Radix) and Zhimu (Anemarrhenae Rhizoma) clear heat pathogens from the intestines and stomach; Shichangpu (Acori Tatarinowii Rhizoma) penetrates the membranes; Qingpi (Citri Reticulatae Pericarpium Viride) reaches the lower jiao; Gancao (Glycyrrhizae Radix et Rhizoma) harmonizes the middle jiao. Thus, the malaria resolves naturally.

Chrysanthemi Flos (Juhua) 40 fen, Atractylodis Macrocephalae Rhizoma (Baizhu) 10 fen, Asari Radix et Rhizoma (Xixin) 3 fen, Poria (Fuling) 3 fen, Ostreae Concha (Muli) 3 fen (left side), Platycodonis Radix (Jiegeng) 8 fen, Saposhnikoviae Radix (Fangfeng) 10 fen, Ginseng Radix (Renshen) 3 fen... [Text fragment].
Grind the above fourteen herbs into a powder. Administer one fangcun bi (a square-inch measure) with wine, three times a day. For the first twenty days, take with warm wine. Avoid all fish, meat, and garlic.

Cheng Yunlai stated: Houshi Heisan (Houshi Black Powder) in the *Jinkui Yaolue* was corrected and appended by Song dynasty scholars to formulas of Tang dynasty physicians. Due to missing content, its commentary is quite detailed. Yu Jiayan... cold administration... Indeed... Most herbs are stir-fried until black, relying on their flavor rather than their qi, utilizing their bitter and astringent properties to enter the empty orifices. Furthermore, reading the instructions below the formula: taking it with warm wine for the first twenty days prevents rapid clogging; subsequent administration for sixty days, while avoiding hot food, allows the medicine to fill the orifices freely. The concept of filling orifices originates from the *Neijing*: "Longly obstructing the emptiness." This is the words of a skilled physician, with genuine historical precedence, which is why I selected it.