It refers to the medicinal solution obtained by removing the dregs after soaking and decocting the prepared herbal pieces in water for a period of time. It is chiefly for oral administration, e.g., Mahuang Tang, Guizhi Tang, etc. Besides it can be applied externally for washing, steaming and gargling. It bears the characteristics of being easily absorbed and producing quick curative effects. It is especially suitable for serious or unsteady cases.
And it can be modified according to the changes of disease. It can meet the need of treatment based on syndrome differentiation, so it is one of the forms most widely used inclinical practice. Nevertheless it has its disadvantages. Firstly, it needs to be taken in large amount, and the effective compositions of some drugs are difficult to extract and easy to volatilize. Secondly, it takes a longer time to Boil the drugs and thus it is not beneficial to the rescue work of critical patients. Thirdly, it is inconvenient to carry and difficult for children to take for its bitter taste.
Powder£º
The drugs are ground into fine powder and well mixed for oral use and external use. Generally the powder for oral administration is usually ground into fine powder to be taken orally with warm boiled water or directly if in small dosage, such as Qili San, Xingjun San, and so on.
Some drugs may be ground into coarse powder to be boiled with water and then the residue is removed to get the liquid for oral use. So they got the name of "boiled powder", e.g. Yinqiao San, Baidu San, etc. The powder for external use is generally applied to or sprinkled on a sore or afected part of the body. Jinhuang San and Shengji San are such examples. But some are for eye droppings or throat insufflation, e.g.Babao Yanyao, Bingpeng San, etc.Powder is prepared easily and absorbed quickly, stable in property, insusceptible of going bad, and convenient to use and carry with less drugs used.
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