Raw Pinellia Tuber Classic Formulas … Natural Herb Library

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Historically served as the source material for the Ban Xia family of phlegm-transforming medicines ... raw Pinellia underlies the classic drying, descending, and vomiting-stopping identity of the herb family, but modern internal use belongs overwhelmingly to processed forms.
Historically redirected rebellious Stomach Qi and transformed phlegm after proper paozhi ... the raw tuber is preserved here mainly to explain why processing became mandatory rather than to encourage crude internal use.
Topical and highly controlled use for swellings or nodules ... raw Ban Xia appears in older external traditions for masses and toxic accumulations where harsh local action was desired.

Xiao Ban Xia Tang and Er Chen Tang belong to the Ban Xia family tradition ... but in modern practice their internal Pinellia role is fulfilled by processed Ban Xia rather than crude raw tuber.
Historical Ban Xia-family phlegm and vomiting formulas are relevant here mainly as lineage context for processing, not as justification for raw self-use.
External swelling applications within the broader Ban Xia and Tian Nan Xing family ... the safer way to understand why the raw material remained in materia medica history.

Traditional Chinese medicine requires Ban Xia to be processed before routine internal use because the raw tuber is irritant and toxic.
Classical incompatibility cautions also place Ban Xia opposite the Wu Tou aconite group, reinforcing that this herb family has never been regarded as casual or benign.