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卷上 论桂枝汤用赤白芍药不同
仲景桂枝汤加减法.凡十有九证.但云芍药.圣惠方皆用赤芍药.孙尚方皆用白芍药.圣惠乃太宗朝命王怀德等编集.孙兆为累朝医师.不应如此背戾，然赤白补泻.极有利害.常见仲景桂枝第四十七证云.
病发热.汗出.此为荣弱卫强.故使汗出.欲救邪风.宜桂枝汤.盖风伤卫而邪乘之.则卫强.荣虽不受邪终非适平也.故卫强则荣弱.仲景以桂枝发其邪.以芍药助其弱.故知用白芍药也.荣既弱而不受病.乃以赤芍药泻之.决非仲景意.至于小建中.为尺迟血弱而设也.举此皆用白芍药.而仲景亦止称芍药.可以类推矣.
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