Ke Xue Fang (Coughing Blood Formula) ké xuè fāng · 咳血方

Safety. Ke Xue Fang is recorded in Danxi Xinfa, the collected teachings of Zhu Zhenheng. Its classical structure is worth stating in one sentence because it is genuinely different from how a modern reader will instinctively read a formula for blood in the sputum: it does not treat the lung as the primary offender. The argument is that liver fire rises and invades the lung, so the formula clears the liver and only then expects the cough to settle. Qing dai and zhi zi cool and drain; gua lou ren and hai fu shi address thick hot phlegm; he zi is astringent and is the one ingredient aimed at holding rather than clearing. It is a formula that reasons about a chain of causes, and the reasoning is coherent within its own framework. What this library will not do is let that reasoning stand in for an assessment. Blood in the sputum has a differential diagnosis, and the items on it are not exotic: pulmonary tuberculosis, lung cancer, bronchiectasis, pneumonia, pulmonary embolism, mitral stenosis and heart failure, bleeding disorders, and anticoagulant and antiplatelet medication. Cough lasting more than eight weeks has its own list, and tuberculosis and lung cancer are on it. Frank haemoptysis can obstruct the airway or exsanguinate, and both are emergencies rather than observations. A person with any of this needs imaging and a clinician, and the time spent on a formula first is time taken away from that. Three ingredient notes belong here. Qing dai is not a herb in the field sense: it is a manufactured product, made by fermenting the leaves of indigo-bearing plants with lime, and therefore varies substantially between sources. Indigo naturalis has been reported in case reports and case series in connection with pulmonary arterial hypertension and with raised liver enzymes; this library records that as reported and unresolved rather than settled. Zhi zi contains geniposide, and geniposide-related liver toxicity has been reported in preclinical studies. Gua lou appears among the classical antagonisms, where the saying pairs it against aconite; that is recorded here as a traditional statement, not as an established fact, and it matters only because gua lou and tian hua fen are different parts of the same plant and are not interchangeable. He zi is rich in tannins, which bind alkaloids, metal ions and some medicines and can therefore reduce absorption, and which constipate at sustained intake. This library does not claim this formula stops bleeding, clears the liver, or treats haemoptysis or any specific disease.