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Treating Shaoyin disease (Shaoyin syndrome), characterized by body pain, coldness of the hands and feet, joint pain, a normal feeling in the mouth (absence of bitterness or dryness), aversion to cold on the back, and a deep pulse.

Fuzi (Aconiti Lateralis Radix Praeparata, raw use, peeled, broken into eight pieces) 2 units; Fuling (Poria) 3 liang; Renshen (Ginseng Radix) 2 liang; Baizhu (Atractylodis Macrocephalae Rhizoma) 4 liang; Shaoyao (Paeoniae Radix Alba) 3 liang. The above five herbs are boiled with 8 sheng of water until 3 sheng remain. Strain the dregs, and take 1 sheng warm each time, three times daily.

[Note] Shaoyin is the zang-organ of cold-water; therefore, severe cases of Cold Damage (Shanghan) often enter the Shaoyin channel. Consequently, the Shaoyin channel has the highest incidence of fatal syndromes. In this formula, two units of Fuzi serve as the sovereign herb, chosen for their sharp potency and primary therapeutic role. Using them raw aims to: first, strengthen the Yang fire of Shaoyin; second, disperse cold from both interior and exterior. Thus, aversion to cold will cease, body pain will be eliminated, and the hands and feet will become warm. This consolidates the root of vital Qi, providing a foundation for the five zang and six fu organs, and roots for the twelve meridians. The pulse will no longer be deep, and the joints will harmonize. Additionally, Baizhu is used to support Earth (Spleen), Shaoyao to pacify Wood (Liver), and Fuling to drain Water (Kidney/Bladder). When Water is drained, Fire naturally prospers; when Fire prospers, Yin pathogens dissipate. When Wood is pacified, Earth becomes stable; when Earth is stable, Water is controlled, allowing for proper transformation and transportation. This is a foolproof method. How many people can be counted who, out of fear, dare not use it and wait helplessly for death?

Treating syndromes such as a deep pulse and reversal cold (Jue-ni) of the limbs.

Gancao (Glycyrrhizae Radix et Rhizoma, honey-fried) 2 liang; Ganjiang (Zingiberis Rhizoma) 1.5 liang; Fuzi (Aconiti Lateralis Radix Praeparata, raw use, peeled, broken into eight pieces) 1 unit. The above three herbs are boiled with 3 sheng of water until 1.2 sheng remain. Strain the dregs, and divide into two warm doses. For robust individuals, increase Fuzi to 1 unit and Ganjiang to 3 liang.

[Note] The formula is named "Sini Tang" (Four-Reversal Decoction) because it treats Shaoyin syndrome characterized by cold throughout the interior and exterior, leading to reversal cold of the four limbs. The sovereign herb is honey-fried Gancao, whose sweet-warm nature warms and nourishes Yang Qi. The minister herbs are Ganjiang and Fuzi, whose pungent-warm nature assists Yang to overcome Cold. Gancao, combined with Ganjiang and Fuzi, stirs Kidney Yang and warms Middle Jiao Cold, possessing the function of "warming Earth within Water." Ganjiang and Fuzi, combined with Gancao, penetrate joints and travel to the four limbs, possessing the power to expel Yin and restore Yang. As Kidney Yang stirs and disperses Cold, Yin dissipates, allowing Yang Qi to reach the exterior; consequently, the pulse rises, and the hands and feet become warm.