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Translation of the original text into modern vernacular Chinese has been completed in the previous step. Now translating that vernacular text into academic English based on WHO standards.

Main indications: Chest and abdominal distension and fullness. Secondary indications: Abdominal pain.

Textual Research (Zheng)
The syndrome pattern of Da Cheng Qi Tang (Major Order the Qi Decoction) presents with: abdominal distension and fullness. It also states: abdominal fullness and pain.
The syndrome pattern of Hou Po San Wu Tang (Magnolia Bark Three-Ingredient Decoction) presents with: pain accompanied by constipation (closure).
The syndrome pattern of Hou Po Qi Wu Tang (Magnolia Bark Seven-Ingredient Decoction) presents with: abdominal distension and fullness.
The syndrome pattern of Hou Po Sheng Jiang Gan Cao Ban Xia Ren Shen Tang (Magnolia Bark, Ginger, Licorice, Pinellia, and Ginseng Decoction) presents with: abdominal distension and fullness.
In these four formulas, the dosage of Hou Po (Magnolia Bark) is half a jin (approx. 250g or 16 liang depending on historical context, kept as 'half a jin' for fidelity).
The syndrome pattern of Zhi Shi Xie Bai Gui Zhi Tang (Immature Bitter Orange, Garlic, and Cinnamon Twig Decoction) presents with: chest fullness.
The syndrome pattern of Zhi Zi Hou Po Tang (Gardenia and Magnolia Bark Decoction) presents with: abdominal distension and fullness.
In these two formulas, the dosage of Hou Po (Magnolia Bark) is four liang.
The syndrome pattern of Ban Xia Hou Po Tang (Pinellia and Magnolia Bark Decoction) presents with: a sensation in the throat as if there were a roasted meat lump obstructing it (Plum-pit qi).
In this single formula, the dosage of Hou Po (Magnolia Bark) is three liang.
The syndrome pattern of Xiao Cheng Qi Tang (Minor Order the Qi Decoction) presents with: significant abdominal distension and fullness with bowel obstruction.
In this single formula, the dosage of Hou Po (Magnolia Bark) is two liang.
Having reviewed all these formulas above, it is clear that the main indication of Hou Po (Magnolia Bark) is to treat distension and fullness.

Cross-Reference Examination (Hu Kao)
The clause for Hou Po San Wu Tang (Magnolia Bark Three-Ingredient Decoction) does not explicitly list "abdominal distension and fullness" as a symptom. This decoction is essentially Da Cheng Qi Tang (Major Order the Qi Decoction) without Mang Xiao (Mirabilite). However, since it logically addresses conditions of abdominal distension, this can be inferred.

Correction of Errors (Bian Wu)
Zhang Yuansu stated: Although Hou Po (Magnolia Bark) can eliminate abdominal distension, it should be used with caution in patients with deficiency; misuse may deplete the patient's Yuan Qi (Original Qi). Wei Ze stated: This is baseless talk. An ancient saying goes: Using toxic substances to attack disease pathogens is appropriate when the disease is in its early stages. When Yuan Qi (Original Qi) is suppressed by pathogens, the physician uses toxic substances to attack the pathogens; once the pathogenic toxins are eliminated, the Qi becomes vigorous. What is there to fear? Let us provide evidence. In Da Cheng Qi Tang (Major Order the Qi Decoction), Hou Po (Magnolia Bark) serves as the Jun (Monarch) herb. Patients presenting with the indications for this decoction often suffer from inability to eat and lack of vital spirit/energy. Upon administering this decoction, the pathogenic toxins are removed. Once the toxins are removed, appetite returns; with appetite, Yuan Qi (Original Qi) becomes vigorous. This occurs frequently. The claim that Hou Po (Magnolia Bark) depletes Yuan Qi (Original Qi) is merely empty talk!

Product Examination (Pin Kao)
Hou Po (Magnolia Bark) produced in China is of superior quality. The variety produced in our country (Japan) is not true Hou Po (Magnolia Bark) and is unsuitable for medicinal use. Some say there are two varieties produced in our country; one of them retains its leaves in winter, which is similar to the variety produced in China proper, and it is found on Mount Hiei.