Bark of Chinaberry Tree Classic Formulas

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Strongly expels intestinal parasites - classically used for roundworm, pinworm, hookworm, and mixed helminth patterns when abdominal pain, irritability, anal itching, or worm expulsion indicate a significant parasitic burden.
Kills parasites and relieves itching externally - powdered or decocted topical use addresses tinea, scabies, eczema, and vulvovaginal itching when damp-heat and parasites combine at the skin surface.
Clears damp-heat from localized toxic lesions - its bitter coldness helps dry dampness and reduce inflammatory itching when hot, weeping, or foul lesions accompany fungal or parasitic skin disease.
Acts as a harsh short-course eliminant rather than a daily tonic herb - traditionally reserved for defined excess conditions and usually combined with supportive or harmonizing herbs to reduce the burden of its toxicity.

Hua Chong Wan (化虫丸) - traditional worm-expelling pill in which Ku Lian Pi is combined with Shi Jun Zi, Bing Lang, and other antiparasitic herbs for stubborn intestinal parasite accumulation.
Lian Liu Er Pi Yin (楝榴二皮饮) - a regional decoction pairing Ku Lian Pi with Shi Liu Gen Pi for hookworm and related intestinal parasite presentations.
External Ku Lian Pi powder or wash preparations mixed with vinegar, oil, or fat are repeatedly recorded in materia medica practice for scabies, tinea, and itching skin lesions.

Ming Yi Bie Lu and later materia medica list Ku Lian Pi as a cold, bitter, toxic bark that powerfully expels worms and should not be overused because of its harsh nature.
TCM Wiki and related educational materia medica emphasize its dual internal-external role: strong antiparasitic action internally and damp-heat itching relief externally.
The classical cautions to decoct thoroughly and avoid prolonged or excessive dosing reflect longstanding recognition that therapeutic value and toxicity sit close together in this herb.