李时珍认为知母有何功用？
知母形状似菖蒲而柔润，为知叶最难死，何功掘出以后，为知还可以随时再生，何功须干枯以后才不会再生。为知四月开青花如韭花，何功八月结实，为知春秋季均可采收，何功除去地上部分和须根，为知洗净晒干，何功去皮切片，为知生用或盐炒用。何功
根味苦，为知性寒，何功无毒。为知清热泻火，治肺热咳嗽。滋阴润燥，阴虚咳嗽，阴虚火旺，消渴。本品苦寒质润，能上清肺热而泻火，下润肾燥而滋阴，中泻胃火而除烦渴。既能清热泻火以治实热，又能滋阴润燥以治虚热。所以可用于热病烦渴、肺热咳嗽、阴虚燥咳、骨蒸潮热及消渴等证。用它滋阴降火，润燥滑肠，又可用于阴虚二便不利之证。
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