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Taiyang and Yangming diseases occurring simultaneously, with wheezing and chest fullness, are not suitable for purgation; Mahuang Tang (Ephedra Decoction) is the primary treatment.
When Taiyang and Yangming diseases occur simultaneously, external pathogens force inward, causing stagnation in the fu organs, rebellion of Stomach Qi, and distension of the Lung, resulting in wheezing and chest fullness. Mahuang Tang is appropriate here. Mahuang (Ephedrae Herba) releases the exterior and induces sweating, while Xingren (Armeniacae Semen Amarum) directs rebellious Qi downward and stops wheezing. Therefore, purgation should not be used.

In Taiyang disease, if there is stiffness and tightness in the neck and back (gang jiang bu rou), accompanied by spontaneous sweating and aversion to wind, Guizhi Jia Gegen Tang (Cinnamon Twig Decoction with Pueraria Root) is the primary treatment.
The Yangming meridian runs along the anterior aspect of the body, descending from the head through the diaphragm to the feet. The Taiyang meridian runs along the posterior aspect, descending from the head through the nape and along the back to the feet. Taiyang meridian pathology typically presents with headache and neck stiffness, but does not usually extend to severe stiffness in the neck and back. This occurs because unresolved exterior Taiyang pathogen stagnates the Qi of the Yangming meridian and fu organs, preventing it from descending smoothly and instead causing it to rebel upward into the chest, diaphragm, and back (the chest is the residence of the fu organs). When the chest and diaphragm become full and distended, it causes obstruction in the neck and back, further blocking the downward flow of Taiyang Qi, leading to stiffness and lack of flexibility in the neck and back. Gegen (Puerariae Radix) drains the Qi of the Yangming meridian, directs rebellious Qi downward, and resolves stagnation.

[Formula Composition] Guizhi (Cinnamomi Ramulus, 3 liang), Shaoyao (Paeoniae Radix Alba, 2 liang), Gancao (Glycyrrhizae Radix et Rhizoma, prepared, 2 liang), Dazao (Ziziphi Jujubae Fructus, 12 pieces), Shengjiang (Zingiberis Rhizoma Recens, sliced, 3 liang), Gegen (Puerariae Radix, 4 liang).
Take the above six ingredients, add one dou of water, first decoct Gegen until the volume reduces by two sheng, remove the foam on the surface, then add the remaining herbs. Decoct until three sheng remain, strain, and take one sheng warm. Cover with blankets to induce a slight sweat; do not consume hot porridge to assist sweating.

In Taiyang disease, if there is stiffness and tightness in the neck and back (gang jiang bu rou), without sweating and with aversion to wind, Gegen Tang (Pueraria Decoction) is the primary treatment.
Nutritive Qi (Ying) is injured by cold, binding the Defensive Qi (Wei) of both Yangming and Taiyang. In Gegen Tang, Gegen drains the Defensive Qi of Yangming, Mahuang drains the Defensive Qi of Taiyang, Guizhi and Shaoyao unblock the collaterals and clear the Nutritive Blood, while Shengjiang, Gancao, and Dazao harmonize the Middle Jiao and tonify Spleen essence.

[Formula Composition] Gegen (Puerariae Radix, 4 liang), Mahuang (Ephedrae Herba, 2 liang), Guizhi (Cinnamomi Ramulus, 2 liang), Shaoyao (Paeoniae Radix Alba, 2 liang), Gancao (Glycyrrhizae Radix et Rhizoma, 2 liang), Shengjiang (Zingiberis Rhizoma Recens, 3 liang), Dazao (Ziziphi Jujubae Fructus, 12 pieces).
Take the above seven ingredients, crush them, add one dou of water, first decoct Mahuang and Gegen until the volume reduces by two sheng, remove the foam on the surface, then add the remaining herbs. Decoct until three sheng remain, strain, and take one sheng warm. Cover with blankets to induce a slight sweat; do not consume hot porridge to assist sweating. Rest and dietary precautions follow those of Guizhi Tang.

When Taiyang and Yangming diseases occur simultaneously, spontaneous diarrhea will inevitably ensue; Gegen Tang (Pueraria Decoction) is the primary treatment.
Exterior cold from Taiyang binds the collaterals externally, forcing and stagnating internally, preventing the Stomach Qi of Yangming from accommodating digested food and fluids. Consequently, the contents must drain downward as diarrhea. Mahuang and Gegen drain the stagnant Defensive Qi of both Taiyang and Yangming meridians, thereby relaxing the internal Qi dynamics.