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Guizhi (Cinnamon Twig, 3 liang, bark removed) Shaoyao (White Peony Root, 3 liang) Gancao (Licorice Root, 2 liang, honey-fried) Shengjiang (Fresh Ginger, 3 liang, sliced) Dazao (Jujube, 12 pieces, torn open)

The above five herbs. Crushed. Boiled in seven sheng of water. Simmered over a mild fire to obtain three sheng. Strained. Taken at a suitable warm temperature, one sheng per dose. After taking the medicine. Shortly afterwards, drink one sheng of hot thin porridge
to assist the medicinal power. Cover with warmth for about one hour. The best outcome is when there is a slight perspiration all over the body. Do not allow profuse sweating like water pouring out. The disease will certainly not be eliminated.
If after one dose sweat appears and the illness resolves, stop subsequent doses. There is no need to finish the entire decoction. If no sweat occurs, repeat the dose. Follow the previous method. If still no sweat, slightly shorten the interval between doses. Within half a day
allow three doses to be finished. If the illness is severe, administer medicine over a day and night. Observe for twenty-four hours. After finishing one prescription, if symptoms persist, prepare another dose. If sweat does not
occur, then administer two or three doses. Prohibit consumption of raw/cold foods, sticky/slippery foods, meat, wheat products, five pungent spices, alcohol, dairy products, and foul-smelling substances. This is the principal formula for treating Taiyang Wind-Strike syndrome (Taiyang Zhongfeng). The Classic states: In Taiyang Wind-Strike syndrome, the pulse is floating on the exterior (Yang) and weak on the interior (Yin). Floating Yang indicates spontaneous heat generation. Weak Yin indicates spontaneous sweating. Feeling cold with shrinking posture (Sese), feeling wind chill as if being sprinkled with cold water (Xixi), feeling feverish as if covered by feathers (Xixi), nasal congestion with dry retching are indications for Guizhi Tang (Cinnamon Twig Decoction). Wei Qi (Defensive Qi) is strong, hence the Yang pulse floats. Ying Qi (Nutritive Qi) is weak, hence the Yin pulse is weak. Wei Qi naturally circulates outside the vessels. Assisted by Wind pathogen,
its Qi floats further outward. Yang governs Qi. Wind is a Yang pathogen. Excess Yang causes Qi to steam easily. Hence, floating Yang results in spontaneous heat. Ying Qi naturally circulates inside the vessels. When disharmonious with Wei Qi, its Qi becomes weaker internally. Yin governs Blood. Sweat is transformed from Blood fluids. Weak Yin leads to easy leakage of fluids. Hence, weak Yin results in spontaneous sweating. "Sese" (feeling cold) indicates deficiency of internal Qi. "Xixi" (feeling wind chill) indicates laxity of the exterior body. One who fears cold inevitably fears wind; one who fears wind inevitably fears cold. They are interdependent, which is why the Classic text discusses them interchangeably. "Xixi" fever describes the sensation on the skin and hair. Nasal congestion indicates obstruction of Yang pathogens. Dry retching indicates rebellion of Yang Qi. These are the clinical manifestations of Taiyang Wind-Strike syndrome. Carefully examine this pattern; this formula is appropriate. Whenever using Zhang Zhongjing's formulas, one must first differentiate the syndrome.
My commentary: The principal herb in this formula is Guizhi because it enters the Ying level to induce sweating, not merely for its ability to expel Wind. Shaoyao is used as an assistant because it harmonizes Ying and pacifies Wind, not merely for its ability to stop sweating. When Guizhi combines with Shaoyao, within the action of inducing sweat, there is still the meaning of astringing fluids. When Shaoyao combines with Guizhi, within the benefit of nourishing blood, there is still the function of transforming Qi. Furthermore, Guizhi relies on the power of Shengjiang to repel externally, guiding the exit route for Wind pathogens. Shaoyao relies on the power of Gancao and Dazao to stabilize internally, cutting off the entry route for Wind pathogens. Those studying Zhang Zhongjing's formulas should deeply seek the rationale behind formula construction.
Furthermore: Zhang Zhongjing annotated Guizhi Tang alone, stating: "Guizhi is originally for resolving the muscle layer." Resolving the muscle layer means releasing pathogens from the muscular exterior without disturbing Ying and Blood. Thus, it demonstrates inducing slight sweat within non-sweating methods. However, Guizhi is inherently a substance that enters Ying to produce sweat. It relies on Shaoyao to restrain the effect of sweating. Modern people mistakenly believe that Guizhi alone can secure Wei and astringe sweat, which is far from the truth. Observing its administration method: "After ingestion, shortly drink hot thin porridge to assist medicinal power. Cover with warmth for about one hour. Slight perspiration all over the body is best. Do not allow profuse sweating like flowing water." This method of regulation possesses profound significance. Drinking hot thin porridge aims to utilize grain Qi to assist Ying and Blood to generate sweat. If sweating is profuse like flowing water, those with weak Ying cannot withstand it. Hence, "the disease will certainly not be eliminated." The subtlety of usage here lies entirely in the balance of Ying and Wei strength. Practitioners prescribing Guizhi Tang must thoroughly comprehend this principle.
Again, the Classic states: "In Taiyang disease, characterized by headache, fever, sweating, and aversion to wind, Guizhi Tang is indicated." This is largely similar but slightly different from the preceding passage on Taiyang Wind-Strike with floating Yang and weak Yin. Why repeat the text? It is unknown that the former passage explicitly reveals Wind-Strike symptoms and indicates the principal formula. This passage generally speaks of Taiyang disease. Symptoms such as stiffness and pain in the head and neck, aversion to cold, are common Taiyang diseases for both Wind-Strike and Cold damage. Similarly, headache, fever, and aversion to wind in this passage are also common patterns for Taiyang Wind-Strike and Cold damage. How can one distinguish whether Mahuang Tang or Guizhi Tang is suitable? The key lies entirely in the presence or absence of sweating. Sweating is the specific indication for Guizhi Tang. If there is no sweating, with fever and a floating-tight pulse, it is a Mahuang Tang pattern. Misusing the acrid-warm nature of Guizhi combined with the sour-astringent nature of Shaoyao would cause Cold pathogens to coagulate with no exit route, leading to numerous complications. This would clearly violate the major contraindication of Guizhi. This is how Zhang Zhongjing teaches syndrome differentiation.
There are three contraindications for Guizhi Tang. Users of Guizhi must know them. First: "Guizhi is originally for resolving the muscle layer. If the pulse is floating-tight, with fever and no sweating, do not administer it." A floating-tight pulse with fever and no sweating indicates Cold damaging Ying. Mahuang Tang is indicated. A floating-slow pulse with fever and spontaneous sweating indicates Wind damaging Wei. Guizhi Tang is indicated. Now, seeing Cold-damaging-Ying patterns, one must not primarily use Wind-damaging-Wei treatments. Because they share common Taiyang symptoms like head/neck stiffness and aversion to cold, and both show floating pulses, they are easily confused. Therefore, it is emphasized: "Always remember this. Do not make mistakes." Failing to observe this and misusing it: if the patient's Ying Qi is originally solid, the pathogen has no outlet and cannot excrete outward. It will necessarily surge upward. Combined with the acrid-warm and sour-astringent properties, it will stagnate the blood in Ying. Until vomiting of pus and blood occurs, it will not stop. Hence, "Anyone who takes Guizhi Tang and vomits will subsequently vomit pus and blood." As for patients habitually drinking alcohol, Guizhi should not be given; taking the decoction causes vomiting. Zhang Zhongjing annotates: "Because alcoholics dislike sweet flavors." Various schools attribute this to pre-existing damp-heat in the stomach of alcoholics, causing fullness, rebellion, and vomiting upon intake. By analogy, any external pathogen complicated by warm-heat should definitely not misuse Guizhi. I often see modern practitioners mistakenly regard Guizhi Tang as an antiperspirant. Encountering damp-warmth or wind-heat patterns where sweating persists without fever resolution, they dare to recklessly use Guizhi without restraint. This was beyond Zhang Zhongjing's anticipation. Such misuse causes harm. Instead of blaming unclear differentiation, they blame ancient formulas as difficult to use. Those referencing this cite Wang Shuhe's saying "Once Guizhi enters the throat, Yang excess leads to death," using these words to warn each other. This shows extreme lack of reflection.
Contraindications of Guizhi
Once clarified, then for any Taiyang disease presenting with head/neck stiffness, aversion to cold, with sweating and a floating-slow pulse, using Guizhi to resolve the muscle layer is unquestionable. Resolving the muscle layer means releasing exterior pathogens while still aiming for slight perspiration. Hence, the Classic refers to Guizhi as inducing sweat. Wanting to induce sweat yet not wishing to induce excessive sweat, it is also called "harmonizing." Harmonizing means the mechanism of sweating will not be rapid. Other formulas take effect according to strict timeframes, whereas after taking Guizhi, if symptoms persist, re-administration is appropriate. Observing its administration: "If after one dose sweat appears and illness resolves, stop subsequent doses. No need to finish the decoction. If no sweat, repeat dose following previous method. If still no sweat, shorten intervals for subsequent doses. Within half a day, finish three doses. For severe cases, administer over a day and night. Observe for 24 hours. After finishing one prescription, if symptoms remain, prepare another dose. If no sweat, up to two or three doses." This is the unchanging method for harmonizing Ying and Wei, resolving muscle layer, and inducing sweat. However, syndrome differentiation must be clear, and medication must match the pathology. Even if immediate effect is not seen, continued administration is viable. Compared to the profuse sweating induced by Mahuang Tang, there is indeed a difference.
Furthermore, Taiyang disease distinguishes between Wind damaging Wei and Cold damaging Ying, prescribing Guizhi and Mahuang methods respectively. This theory originated with Xu Yixue. Fang Xingzhong of the late Ming Dynasty and Yu Jiayan, Cheng Jiaoqian of the Qing Dynasty followed this view. Only Ke Yunbo argued that Guizhi Tang, for anyone with headache, fever, aversion to wind/cold, floating-weak pulse, and spontaneous sweating, regardless of meridian involvement or whether it is Wind-Strike, Cold damage, or miscellaneous disease, can be used to induce sweat. If mistaken sweating or purging fails to resolve the exterior, Guizhi should still be used to resolve the muscle layer. Inferring Ke's intent, he likely noted that Zhang Zhongjing applied Guizhi Tang across various meridians frequently, thus supporting this generalization. However, upon careful examination of the Classic text: regarding the passage "Cold damage, after sweating resolves, half a day later restlessness returns, pulse floating and rapid, can induce sweat again, Guizhi Tang is indicated," Ke likely used this to argue Cold damage also suits Guizhi. But the text mentions Cold damage was treated with sweating (implying Mahuang Tang previously). Half a day later restlessness returns, pulse turns floating-rapid. This indicates that after sweating, external Wind pathogens are easily attacked, while internal Ying Qi is already injured. Restlessness stems from Heart disturbance; rapid pulse indicates Yin deficiency. How can one bear further administration of Mahuang? The switch to Guizhi is not because Taiyang Cold damage suits Guizhi, but because post-sweating restlessness with floating-rapid pulse specifically suits Guizhi. Regarding Yangming disease also using Guizhi: "Yangming disease, slow pulse, profuse sweating, slight aversion to cold, exterior unresolved, can induce sweat, Guizhi Tang is indicated." Yangming disease typically involves profuse sweating but aversion to heat, not cold. Current slight aversion to cold indicates Taiyang exterior syndrome has not resolved. Urgently, one must draw the pathogen out via Taiyang. This is not Yangming disease suiting Guizhi, but Taiyang exterior unresolved specifically suiting Guizhi. Furthermore, the subsequent text states: "Yangming disease, floating pulse, no sweating, wheezing, inducing sweat leads to recovery, Mahuang Tang is indicated." Comparing these two passages, one must know that when pathogens enter Yangming from Taiyang, observe if they came from Taiyang Wind-Strike with unresolved Wind-Strike patterns; treat according to Wind-Strike methods. If from Taiyang Cold damage with unresolved Cold damage patterns; treat according to Cold damage methods. This further confirms Guizhi and Mahuang dividing responsibilities for Wind-Strike and Cold damage as natural, unchangeable rules. The Three Yin meridians have no precedent for sweating methods. Although Taiyin disease has a clause for sweating due to floating pulse, it is not that Taiyin disease suits Guizhi. Rather, floating pulse warrants sweating, and the Shaoyao, Shengjiang, and Dazao in this formula can help stabilize Taiyin. If one claims that after mistaken sweating/purging with unresolved exterior, Guizhi should be used to resolve muscle layer: consider what constitutes mistaken sweating. It precisely refers to using Mahuang for Guizhi patterns or Guizhi for Mahuang patterns. Moreover, after sweating, Guizhi Tang should not be reused. After purging, Guizhi Tang should not be reused. Zhang Zhongjing sets explicit prohibitions. Cases where Guizhi is suitable after mistaken purging require observing floating pulse and rebellious Qi rising. Only then can it be given. Otherwise, do not give it. Zhang Zhongjing's text is clear and easy to understand. If following Ke's interpretation, one seeks confusion amidst diversions, increasing disorder, leaving later students without direction. Since Wind-Cold pathogens enter via Taiyang, Taiyang is the first step for scholars of Cold Damage. Unclear origins lead to errors from the start. I therefore do not hesitate to cite the Classic to directly dispel confusion, ensuring clinical prescription has certainty and avoids chaos.
Furthermore: Guizhi Tang was established for early Taiyang disease, but may be suitable even after prolonged duration, provided exterior symptoms remain unresolved. Ke's categorization of mistaken sweating and purging cannot be lumped together; they must be distinguished. After mistaken sweating, variations like Yang collapse and wind leakage occur, requiring specific rescue formulas. Although Zhang Zhongjing mentions "Severe purging in Cold damage followed by sweating, epigastric fullness, aversion to wind, exterior unresolved, do not attack fullness, must first resolve exterior," this is because the fullness resulted from mistaken purging, and exterior unresolved status was identified via aversion to cold. Thus, exterior must be resolved first before attacking fullness. There is no other explicit text regarding reusing Guizhi after sweating. For complex exterior-interior pathogens requiring interior-first treatment: if diarrhea with undigested food, abdominal fullness, body pain exist, interior urgency exceeds exterior slowness. Must first warm the interior, then attack the exterior. Wait until diarrhea stops but body pain persists, then consider harmonizing the exterior. Exterior resolution still relies on Guizhi methods. The variations and changes herein possess profound principles. One must familiarize oneself with the Classic during study and carefully analyze pulse and symptoms clinically. Then, among 113 formulas, none will be misused. Why only Guizhi?
Furthermore: Guizhi is indeed the principal formula for Taiyang. Rescue methods derived from this formula vary significantly whether adding or subtracting one herb. Merely adjusting dosages in the original formula creates new names with distinct therapeutic targets. For example, adding Gui (Cinnamon Bark) to this formula creates Guizhi Jia Gui Tang (Cinnamon Twig Plus Cinnamon Bark Decoction); heavily increasing Shaoyao creates Guizhi Jia Shaoyao Tang (Cinnamon Twig Plus White Peony Root Decoction), etc. Each requires separate explanation, appended after this formula, with this formula serving as the ancestral source. Hence, it heads the list of 113 formulas.