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认为对人体气血阴阳具有补益作用的一些药物，如黄芪、甘草、白术、当归、何首乌、麦冬等，同时又分别兼有通泻作用，即疏通脏腑气血、通利经脉、破散结滞、祛除邪气。其作用机理主要可归纳为：①量效关系：药物的功效随剂量的增减而变化，即“少用壅滞，多用宣通”；②证效关系：药物功效的发挥与证候的性质有关，证候不同，体内气血阴阳状态各异，故对药物反应不一；③脏腑机能状态：五脏主藏精气，六腑主泄浊，在脏滋养气血阴阳为补，在腑则以通为补；④修制与配伍也对药物的功效产生重要影响。现代药理研究结果也为某些补益药之通泻作用提供了实验依据。
It is believed that some drugs that have replenishing effects on qi and yin and yang of human body, such as astragalus, licorice root, Atractylodes macrocephala, angelica, fleece-flower root, ophiopogon japonicus, etc., also have both diarrhea and diarrhea, namely dredging visceral blood, meridian meridians, and breaking up knots. Lag, eliminate evil. The mechanism of action can be summarized as: 1 dose-effect relationship: The efficacy of drugs changes with the increase or decrease of the dose, that is, “the use of stasis lag, and more use of propaganda”; 2 the relationship between the efficacy of the drug: the efficacy of the drug and the nature of the syndrome Relevant, syndromes are different, the state of qi and blood in the body is different, so the reaction to drugs is not the same; 3 organs function status: the five internal organs to hide the essence of gas, the six main phlegm turbidity, in the dirty nourish blood and yin and yang as a supplement, in As a supplement; 4 modification and compatibility also have an important impact on the efficacy of drugs. The results of modern pharmacology also provide experimental evidence for the effect of certain tonic drugs.