Natural Herb Library

Raw Pinellia Tuber

Chinese
半夏
Pinyin
Ban Xia
Latin
Rhizoma Pinelliae
Botanical illustration of Tuber of Pinellia, Pinellia ternata, showing raw tubers, dried medicinal pieces, trifoliate source leaves, and diagnostic plant details.
Botanical plate by Kodi .

Known in TCM as Ban Xia (半夏), this acrid, warm herb enters the Lung, Spleen, and Stomach. Traditionally, it 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, most often applied for nausea, phlegm accumulation, and productive cough. Modern research has identified Lectin among its active constituents.

Part used: Rhizome

Also Known As

Ban Xia Raw pinellia Pinelliae Rhizoma

Latin: Rhizoma Pinelliae | Pinyin: Ban Xia | Chinese: 半夏

TCM Properties

Taste
acrid
Temperature
warm
Channels
Lung, Spleen, Stomach

Traditional Use

Primary Actions

  • 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.

Secondary Actions

  • This page must stay sharply distinct from `prepared-pinellia-tuber`, `prepared-tuber-of-pinellia`, and `pinellia-tuber-leaven` ... the raw tuber is a toxic historical source-material lane, not a routine internal pharmacy item.
  • The most important clinical fact about raw Ban Xia is that toxicity is the reason the processed siblings exist.

Classic Formulas

  • 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.

Classical References

  • 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.

Modern Research

Active Compounds

  • Lectin and protein fractions ... major contributors to raw irritant toxicity
  • Calcium oxalate raphides and related irritant structures ... central to the raw tuber's caustic profile
  • Polysaccharides and other secondary metabolites ... part of the broader pharmacology literature once toxicity is modified by processing

Studied Effects

  • A 2025 systematic review of Pinelliae Rhizoma summarized botany, ethnopharmacology, phytochemistry, preclinical, and clinical evidence and is the clearest modern overview for the Ban Xia family as a whole (PMID 39855824).
  • A 2023 review on Pinellia ternata covered traditional uses, pharmacology, toxicity, and quality control, reinforcing that raw-versus-processed distinction is central rather than optional (PMID 38058630).
  • A 2024 paper showed that processing drives toxic lectin reduction and bioactive peptide enhancement in Pinellia ternata, directly supporting the classical insistence that crude raw Ban Xia is not equivalent to processed medicinal material (PMID 39525387).

PubMed References

Safety & Interactions

Contraindications

  • Pregnancy
  • Any unsupervised internal use of crude raw material
  • Dry cough from Yin deficiency without damp-phlegm
  • Concurrent use with Wu Tou type aconite preparations in classical incompatibility traditions

Cautions

  • Raw Ban Xia is irritant and toxic and can injure the mouth, throat, and gastrointestinal tract.
  • Crude raw tuber, processed Ban Xia, and fermented Ban Xia products are not interchangeable.
  • Preclinical work has also raised interaction concerns around drug-metabolizing enzymes, adding another reason to avoid casual use.

Conditions

Frequently Asked Questions

What is Raw Pinellia Tuber used for?

Raw Pinellia Tuber is traditionally used to 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.. Research has investigated its effects on: A 2025 systematic review of Pinelliae Rhizoma summarized botany, ethnopharmacology, phytochemistry, preclinical, and clinical evidence and is the clearest modern overview for the Ban Xia family as a whole (PMID 39855824).; A 2023 review on Pinellia ternata covered traditional uses, pharmacology, toxicity, and quality control, reinforcing that raw-versus-processed distinction is central rather than optional (PMID 38058630)..

What are other names for Raw Pinellia Tuber?

Raw Pinellia Tuber is also known as Ban Xia, Raw pinellia, Pinelliae Rhizoma. In TCM: 半夏 (Ban Xia); Rhizoma Pinelliae.

Is Raw Pinellia Tuber safe during pregnancy?

Raw Pinellia Tuber is not recommended during pregnancy.

What are the contraindications for Raw Pinellia Tuber?

Raw Pinellia Tuber should not be used in: Pregnancy; Any unsupervised internal use of crude raw material; Dry cough from Yin deficiency without damp-phlegm; Concurrent use with Wu Tou type aconite preparations in classical incompatibility traditions. Consult a qualified practitioner before use.