Shield Fern Rhizome Classic Formulas … Natural Herb Library

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Clears heat and resolves toxicity ... Guan Zhong is used for epidemic-fever logic, toxic heat in the throat, and inflammatory states where a cold bitter fern rhizome is appropriate.
Expels and kills intestinal parasites ... traditional use includes roundworm and tapeworm patterns when a stronger parasite-focused herb is needed.
Cools blood and stops bleeding ... the charred form is classically used when heat agitates the blood and bleeding needs a cooling hemostatic approach.

Parasite-expelling formulas ... used when intestinal worms are clinically obvious and stronger cold agents are appropriate.
Heat-toxin and epidemic-prevention logic ... older teaching includes prophylactic and outbreak-season use in some regional traditions.
Charred-form hemostatic use ... selected when cooling blood and stopping bleeding become the priority.

Traditional materia medica consistently treats Guan Zhong as a cold fern-rhizome medicine for parasites, heat-toxin, and blood heat.
Charred Guan Zhong has a separate hemostatic emphasis, which is why the raw and charred lanes should not be mentally collapsed.