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The formulation logic of Xuanfu Hua Tang (Inula Flower Decoction) is derived from the heavy use of Banxia (Pinelliae Rhizoma) in Banxia Banliu Tang (Banxia Half-Sheng Decoction) and from Banxia Xiexin Tang (Pinellia Decoction to Drain the Epigastrium). *Renjing Jing* (Mirror of Human Vision) specifically relies on the statement in *Neijing* (Inner Canon) that "obstruction (Ge, 膈) is caused by the knotting of the three Yang meridians." It employs San Yi Chengqi Tang (Three-One Purging Decoction) to purge step-by-step, allowing new food to be accepted once old stagnation is removed. This also aligns with the principle of treating both interior and exterior as seen in Dahuang Gancao Tang (Rhubarb and Licorice Decoction) in this treatise. This does not contradict ancient methods. Therefore, my father preserved these theories in his works *Shifang Miaoyong* (Wonderful Uses of Contemporary Formulas) and *Yi Er Shu*, although he considered them less precise than those in *Jingui Yaolue*. Regarding Changpi (Intestinal Dysentery), my father further supplemented the discussion on latent pathogens and extraordinary diseases beyond *Jingui Yaolue*, leaving no meaning unexplained. The contemporary scholar Zhang Xin said: Dysentery is a disease of latent pathogens. In summer, one may contract minor cold due to non-seasonal weather or consume too many melons and fruits due to greed for coolness. Since the Stomach dislikes cold, one may not initially feel ill. Over time, the pathogen stagnates and transforms into heat, transmitting from the Small Intestine to the Large Intestine. As the Large Intestine prefers warmth, one may not perceive it as illness either. However, after autumn, due to dryness, exposure to cold air, or irregular diet, the latent pathogen is triggered, leading to sudden diarrhea, followed by tenesmus, passage of pus and blood (red and white), and lower abdominal pain. Severe cases may develop into the critical condition of inability to eat (Jinkou, 噤口). One must understand that the cold pathogen resides in the Stomach, while the heat pathogen resides in the Intestines. This is a disease where cold and heat have been latent for a long time before suddenly manifesting. One should use Shaoyao Tang (Peony Decoction) to purge the latent heat in the Large Intestine; once the pathogen is expelled, the healthy Qi will naturally ascend to protect the Spleen and Stomach. If there is no effect, immediately use Lizhong Tang (Regulate the Middle Decoction) to treat the latent cold in the Stomach, adding Dahuang (Rhei Radix et Rhizoma) to drain the latent heat in the Large Intestine. This single formula grasps two key aspects simultaneously. However, I heard from senior physicians that Ginseng and Atractylodes macrocephala should be used cautiously in dysentery treatment, which is a well-founded statement. One must always adapt flexibly during clinical practice. Zhang Yinan said: Among the chapters in *Neijing* discussing diseases, fewer than twenty are dedicated to general diseases, while eight chapters discuss extraordinary diseases. There are cases of lower discharge due to extraordinary conditions, where the Qi of the three Yang meridians arrives together, overwhelming the three Yin meridians. Accumulation leads to fright; the disease arises like a swift wind, progressing rapidly like grinding stones, causing blockage of all nine orifices, overflow of Yang Qi, dry throat, and obstruction of the pharynx. If it merges with Yin, it moves unpredictably up and down, pressing into the intestines to cause Changpi (Intestinal Dysentery). The pulse is slow, small, late, and choppy. If the blood feels warm and the body is hot, death ensues; if heat persists for seven days, death ensues. This is because Yang Qi is excessively vigorous, injuring Yin Qi, hence the pulse is small, deep, and choply. Immediate treatment with Dachengqi Tang (Major Order the Qi Decoction) is required to purge Yang and nourish Yin; delay renders it incurable. If physicians do not understand the etiology of extraordinary diseases and, seeing a harmonious pulse, use mild and ordinary formulas, what difference is there from using poison? (Ye Daguan suffered from this disease and died due to mistaken tonification.)