Why should ephedra and pueraria lobata be fried first to remove foam?

Ephedra is often fried first, so we must say "de-foaming". The second-level teacher did not explain the reason, and the ancient books did not see circumstantial evidence. Although it is a small problem, it has become an eternal mystery. Because it involves logical thinking, I will simply analyze it. There are two opinions that have great influence on the textual research of previous annotations: First, Tao Hongjing thinks it is "boring". Second, Zhang Xichun pointed out that "the bubble contains the power of publishing". Tao's theory may belong to personal experience, because Mahuang decoction is mostly caused by cold evil, and all of them have different degrees of yang depression. Ephedra is pungent and helps sweat and dissipate heat. When taking medicine, you may be upset because of heat stagnation. However, there are still three problems: first, the problem of logical thinking. There are too many prescriptions and syndromes of ephedra, and those who are not exterior syndromes and have no pathogenesis of yang depression are hard to get bored. Why should ephedra be treated from the outside to the inside? Second, whether "hate" should be attributed to "bubble" is not enough evidence. Third, people now fry ephedra soup instead of soaking it, and they don't see people who are often annoying. It can be seen that Dow's statement is unconvincing. Zhang's theory is even more unreasonable. The reason why Mahuang decoction uses ephedra is aimed at the pathogenesis of the sun that cold blocks the muscle surface, and the membrane is opened to sweat. In other words, it takes advantage of the "publishing power" of ephedra. If the "bubble contains publishing power" is true, shouldn't it be treated? How can you go there? Or: to prevent ephedra from publishing too much. Then, use Daqinglong decoction, which is particularly effective in treating colds and even suppressing fever due to yang, for six taels at a time to relieve sweating. It can be said that ephedra needs "strength". Why does it also "bubble"? Zhang's theory is also a guess. The problem of frying ephedra to remove foam first should be viewed historically in combination with Neijing. Zhong Shi wrote Treatise on Febrile Diseases with nine volumes of Su Wen, which shows that Treatise on Febrile Diseases is inextricably linked with Neijing in theory. In Su Wen, Yin and Yang should be like a big theory. It says: "Clearing Yang causes stagnation, turbid Yin moves five internal organs", and it also says: "Yin tastes the lower orifices, while Yang feels the upper orifices". Zhong Shi applied the theory of Yin and Yang, clearing turbidity and ascending and descending of this medicine to the syndrome differentiation and treatment of classic prescriptions. It is inferred that the foam removal of ephedra is firstly the "foam" of ephedra in the process of boiling, but Zhong Shi (or a physician before Zhong Shi) intuitively thinks that the foam is turbid, which will hinder the hair from rising, help to remove the light and clear ephedra, and help to make the hair shy and get out of the head. As Ke Yunbo said: "Those who remove foam only take the meaning of clearing yang and making knees." It can be said that it is right. Connecting with the medication of the whole Treatise on Febrile Diseases, it can also be confirmed that Zhong Shi attaches great importance to the theory of clearing turbidity and lifting drugs in Neijing, not just the problem of "eliminating foam" of Herba Ephedrae. In Guizhi Jiagegen Decoction, Gegenqin Decoction and Gegenqin Li Antang, Gegen emphasized frying to remove foam first, which is the reason. Among these prescriptions, Pueraria lobata has the function of relieving exterior evils and promoting body fluid, and it needs the light and clear qi of Pueraria lobata to play the role of external dispersion, so it also removes the heavy turbid foam that hinders the rise. Then, it can be further explained that Zhong Shi is very good at using the theory of clearing turbidity and ascending and descending drugs to guide prescription medication. What Dahuang Huanglian Xiexin Decoction "clears" is "full of qi", which is caused by the accumulation of invisible qi and heat 1 1. The evil knot should be "diarrhea", but the invisible evil should not be "diarrhea". The evil knot is treated with Dahuang Huanglian, and the invisible heat is not treated with Dahuang Huanglian. Therefore, Zhong Shi used the theory that the smell is strong and weak to provoke people, thus adopting this special method of dyeing without frying. On the one hand, he took the light and clear gas of rhubarb and coptis root to clear his heart and remove the new things; On the other hand, it can avoid the harm caused by the strong flavor of rhubarb and coptis root, which can be described as ingenious medication, similar to the "defoaming" of ephedra and pueraria root. Except that the notes of Houpu Mahuang Decoction in Synopsis of the Golden Chamber did not mention frying first to remove foam (for fear of omission), ephedra and kudzuvine root were used without exception, which shows that Normal University attaches great importance to this issue. So how should we look at this problem today? First of all, we should recognize and understand the objective existence and significance of ephedra and pueraria in Treatise on Febrile Diseases. As for the "foam" of ephedra and pueraria lobata, is it turbid? Is there any obstacle to Sheng Qing? When combined with modern pharmacology for further exploration. Judging from the current experience of using ephedra and pueraria lobata, there is no need to haggle over whether to remove foam.