Xuan Fu Dai Zhe Tang (Inula and Hematite Decoction) xuán fù dài zhě tāng · 旋覆代赭汤

Safety. Xuan Fu Dai Zhe Tang comes from Shanghan Lun, and its line is unusually concrete: after sweating, or vomiting, or purging has been used and the exterior has resolved, if there is a hard glomus below the heart and the belching does not settle, this is the formula. Two findings, one qualifier — the belching does not settle — and the prescription follows. It is a good example of how narrowly a classical indication could be drawn, and of how much of the reasoning rests on what happened before rather than on the symptoms alone. Structurally it is a stomach formula with a mineral at its centre. Inula flower is the herb traditionally said to send qi downward and soften the glomus; hematite, a heavy iron ore, adds weight in both the literal and the figurative sense; processed pinellia dries and dissipates; ginseng, jujube and honey-fried licorice support the middle that the earlier treatment has worn down. Read plainly, this is a formula built for someone whose digestion has been emptied by treatment and whose stomach now pushes upward instead of down. The modern translation of that picture is not one disease. Persistent belching and a sensation of hardness or a lump under the breastbone sit across gastro-oesophageal reflux, hiatus hernia, functional dyspepsia and oesophageal motility disorders, and — less often, and far more seriously — gastric and oesophageal cancer. The features that change the plan are not the belching: progressive difficulty swallowing, food sticking, unintentional weight loss, vomiting, anaemia, or black stools all point to endoscopy, and none of them is answered by a formula. This library does not present this prescription as a treatment for reflux, cancer, or any named condition. Hematite deserves separate attention. Dai zhe shi is an iron ore, and mineral substances in this tradition are not exempt from the reason modern pharmacopoeias test them: naturally occurring ores carry arsenic, lead and other metals depending on the seam. Traditional preparation specifies calcining and vinegar quenching, and the classical texts themselves caution against long courses and against use in pregnancy. Iron loading is an additional concern for anyone with haemochromatosis or a history of repeated transfusion. A mineral ingredient is a reason to ask what the batch was tested for, not a curiosity. Pinellia must be the processed form; raw pinellia contains calcium oxalate raphides and lectins that can produce severe throat swelling and threaten the airway, and it is traditionally held incompatible with aconite-type herbs. Ginseng has mixed and sometimes contradictory evidence with warfarin and interacts with glucose-lowering medicines. Honey-fried licorice carries the glycyrrhizin risk noted elsewhere in this library. Ginger in food amounts is unremarkable, while concentrated ginger products have reported antiplatelet effects.