Herbs that Clear Heat and Resolve Toxicity

In clearing heat toxicity, what is Shan Dou Gen's (sophorae tokinensis radix's) specialty?

Both Shan Dou Gen and She Gan are especially good for the throat.

Source: Chen, J. and Chen T. (2012). Chinese Medical Herbology and Pharmacology. City of Industry, CA: Art of Medicine Press. pp. 261 [Q571]