Antifebrile Dichroa Root Classic Formulas … Natural Herb Library

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Induces vomiting to expel phlegm and stop malaria ... Chang Shan is one of the classic strong herbs for intermittent fever patterns with phlegm retention or lurking pathogen logic.
Cuts recurrent cyclical fever patterns ... the herb is historically valued not as a general antipyretic but as a targeted medicine for severe intermittent disorders.
Transforms stubborn phlegm-fluid congestion ... traditional use includes cases where nausea and upward discharge are accepted consequences of a strong therapeutic intention.

Chang Shan Yin and related intermittent-fever formulas ... used when cyclical malarial patterns are the core target.
Phlegm-retention fever combinations with Cao Guo, Hou Po, or Ban Xia logic ... selected when obstruction and lurking pathogen patterns coexist.
Historically strong single-herb or small-formula use where emesis is intentionally accepted as part of treatment.

Materia medica tradition consistently describes Chang Shan as bitter, cold, and emetic, with an especially narrow role in intermittent fever and phlegm-related disorders.
Its use is strong enough that many classical discussions focus as much on tolerance and caution as on efficacy.