Rhizome and Root of Black Falsehellebore Classic Formulas … Natural Herb Library

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Induces vomiting of stubborn phlegm and retained food ... Li Lu is a harsh emetic preserved mainly as a historical toxic herb rather than a routine modern internal medicine.
Kills parasites and relieves itching externally ... powdered Li Lu was applied to scabies, damp skin disease, lice, and other parasitic or intensely itchy lesions.
Dries dampness and attacks toxic skin conditions ... classical use includes chronic wet lesions where a toxic antiparasitic mineral-or-herb approach was desired.

Historical emetic use for acute phlegm obstruction ... Li Lu belongs to an older therapeutic logic that is rarely carried forward in routine modern practice.
Topical parasite and itch preparations ... external powders with oil or lard were used for scabies and stubborn wet-toxic skin disease.
Classical incompatibility lists ... Li Lu is a reference herb in the Eighteen Incompatibilities tradition.

Traditional materia medica describes Li Lu as bitter, acrid, cold, and highly toxic, used to induce vomiting and kill parasites.
Older herbology repeatedly warns against combining Li Lu with important tonic and yin-nourishing roots, making the incompatibility teaching part of its core identity.