Toad Venom Classic Formulas … Natural Herb Library

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Opens the orifices and revives consciousness ... Chan Su was historically used for sudden collapse, fainting, and closed presentations where turbid toxin or shock-like obstruction was said to block awareness.
Resolves toxicity and reduces swelling ... traditional use includes severe sore throat, oral or skin ulceration, carbuncles, and other intensely inflamed toxic swellings.
Relieves severe pain ... because the material is intensely active and toxic, this role appears in very small internal doses or carefully controlled topical use rather than in routine decoction practice.

Liu Shen Wan ... a classic toxic-swelling and throat-pain patent tradition in which Chan Su appears in tiny amounts.
Aromatic resuscitative pill traditions ... historical use for collapse and closed presentations belongs to this lane rather than to ordinary tonic prescribing.
Topical toxic-swelling powders and ulcer applications ... a practical external route when the aim was to attack toxin and relieve pain without relying on large internal dosing.

Traditional herbology describes Chan Su as a toxic, strongly acting substance that opens the orifices, attacks toxin, reduces swelling, and relieves pain.
The combination of resuscitative use and toxic-swelling use explains why Chan Su has always been regarded as potent and hazardous rather than as a routine materia medica staple.