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In the prescription of Guizhi Tang (Cinnamon Twig Decoction), add two liang of Gui (Cassia Bark/Cinnamon Twig) more, making the total five liang. Take the above five medicinal materials, boil in seven sheng of water, reduce to three sheng, remove the dregs. Take one sheng warm.

Guizhi Tang treats Taiyang Wind-Strike syndrome (Taiyang Wind-Strike); it is a sacred medicine for harmonizing Ying and Wei. Now, adding Gui to the original formula establishes a new decoction name, and its indicated disease is completely different. This shows the strictness with which ancient sages established prescriptions; even the dosage must not be careless. The Classics state: "In Taiyang Cold Damage, if warming needle therapy is added, palpitations will surely occur." It also states: "If burning needles are used to induce sweating, and the needle site is exposed to cold, causing nodules to rise and turn red, Ben Tun (Running Piglet) will surely develop, with Qi rushing from the lower abdomen up to the heart." In such cases, moxa should be applied once on each nodule, and Guizhi Jia Gui Tang (Guizhi Decoction plus Cinnamon) should be administered. Ben Tun is a syndrome where Kidney Water overacts upon the Heart. Why use a Taiyang formula like Guizhi Tang? Because Taiyang governs the Qi of all Yang meridians, and the Heart Master executes the command of Taiyang. Taiyang Cold Damage should theoretically be treated by inducing sweating. Sweat is the fluid of the Heart, relying entirely on the True Yang of the Heart Master to transform Qi and expel pathogens. Misusing warming needles causes Cold pathogens not to exit outward but to enter inward. Once inside, they disturb the Ying level of the Heart. Heart Yang is forced by Cold pathogens, leaving the Monarch (Heart) isolated and in danger, allowing Kidney Water to take advantage. Nodules rising and turning red indicate that Heart Yang cannot consolidate internally, and its color manifests externally. Qi rushing from the lower abdomen to the heart indicates Water pathogen counterflow, threatening to extinguish the True Fire. Therefore, urgent moxibustion on the nodules is needed to first warm the meridians and restore Yang. Reusing Gui Zhi (Cinnamon Twig) in the formula works because Gui Zhi can directly enter the Ying level, support Yang and transform Qi. With this heavy reinforcement raising the banner, the Monarch can振奋 itself, and Kidney Water naturally descends. This drains North (Water) and supplements South (Fire), achieving two goals with one stroke. It is a victorious army. Regarding adding Gui to this formula, some interpret it as adding Rou Gui (Cinnamon Bark) in addition to Gui Zhi. However, given the phrase "total five liang," it likely still refers to Gui Zhi. Moreover, since this condition arises from mismanagement of Taiyang disease, heavily using Gui Zhi aims to achieve both internal pacification and external expulsion through a single herb.

To the Guizhi Tang formula, add one Fuzi (Prepared Aconite Root), processed, peeled, broken into eight pieces. Follow the previous method for the rest.

This is a formula treating sweating leakage due to wind exposure. The Classics state: "In Taiyang disease, after inducing sweating, if sweating continues unceasingly, the patient feels aversion to wind, has difficulty urinating, slight stiffness in the four limbs, and difficulty bending and extending them, this formula is indicated." Taiyang disease should ideally result in only a slight sweat; one must not induce profuse sweating like flowing water. When Wei Qi withdraws its defense, Ying Yin cannot hold, leading to unceasing leakage. With pores open, Wind has no resistance, and body fluids are entirely lost along with Yang Qi, failing to seep into the Bladder to moisten sinews. This leads to difficult urination, slight limb stiffness, and inability to bend or extend. All these complications arise because Wei Qi's protection has collapsed, causing internal fluids to rush outward uncontrollably. Urgently, while fluids are not yet exhausted, one must consolidate Wei Qi so that outward-flowing fluids return inward. Thus, Guizhi Tang plus Fuzi is used; the method of consolidating Wei Qi serves as the method of saving Yin fluids. This condition presents entirely as Wei Qi leaking outward and Yin fluids being deprived internally. Fuzi is a drying agent, yet Zhang Zhongjing uses it to save fluids. What is the rationale? Since Wei Yang is about to collapse, only the powerful force of Fuzi can swiftly enter the Wei level to restore Yang. By rapidly consolidating Wei Yang and cutting off the path of outward leakage, the body's inherent fluids can return inward. Once Yang returns, fluids naturally recover, without needing other herbs to generate fluids and moisten dryness. This is why the prescription is considered sagely. Adding Fuzi to this formula shares the same principle as using Zhenwu Tang (True Warrior Decoction) for Yang Collapse syndrome. Yu Jiayan stated: This condition involves the simultaneous loss of Yang Qi and Yin fluids, compounded by re-entry of external Wind, differing slightly from pure Yang Collapse. Therefore, Guizhi Jia Fuzi Tang (Guizhi Decoction plus Prepared Aconite) is used to consolidate the exterior, expel Wind, restore Yang, and astringe fluids.