Bàn Xià (半夏) — Pinellia Rhizome

On this page

1. Overview
2. Properties
3. Actions and indications
4. Key formulas
5. Modern research
6. Incompatibilities
7. Cautions and contraindications
8. Treatment at my clinic

1. Overview

Bàn Xià (半夏) — Pinellia ternata — is known in English as Pinellia rhizome / Crow-dipper. It belongs to the category of Herbs that transform Phlegm-Cold in the Chinese Materia Medica and is one of the most important and widely prescribed herbs in traditional Chinese medicine (TCM). It is used in Chinese herbal medicine both as a component of classical herbal formulas and as a significant individual herb in tailored prescriptions.

I prescribe Bàn Xià as part of bespoke herbal formulas from pharmaceutical-grade granules sourced from Sun Ten in Taiwan — independently tested to the highest international quality and safety standards. Herbs are never prescribed individually outside a properly balanced formula; they are always combined with other herbs selected to match the patient’s individual TCM pattern. Online consultations are available for patients who cannot attend my clinic in person.

2. Properties

3. Actions and indications

Principal actions

1. Dries Dampness and transforms Phlegm
2. Descends rebellious Qi and stops vomiting
3. Dissipates nodules and reduces swelling
4. Harmonises the Stomach

Indications

1. Cough with copious white or clear sputum from Cold-Phlegm
2. Nausea and vomiting from various causes — the principal antiemetic herb in TCM
3. Dizziness and vertigo from Phlegm-Damp
4. Morning sickness during pregnancy (in processed form, prepared with ginger)
5. Phlegm nodules — goitre, lymph nodes, lipomas
6. Insomnia from Phlegm-Fire disturbing the Heart (combined with cooling herbs)
7. Chest tightness and epigastric fullness from Phlegm obstruction

4. Key formulas containing Bàn Xià

Bàn Xià is an ingredient in many classical formulas. The following are among the most important:

• Er Chen Tang
• Ban Xia Xie Xin Tang
• Ban Xia Hou Po Tang
• Wen Dan Tang

See the full Chinese herbal medicine formula directory for detailed information on all 88 classical formulas.

5. Modern research

Pinellia ternata (Ban Xia) has been subject to significant pharmacological research. In clinical use, only the processed (detoxified) forms are used — Fa Ban Xia (processed with alum), Jiang Ban Xia (processed with ginger) and Qing Ban Xia (processed with limonite). Key bioactive constituents include alkaloids, lectins, homogentisic acid and beta-sitosterol. Research confirms antiemetic properties (used clinically in chemotherapy-induced nausea), anti-tussive effects, anti-tumour activity against cervical and lung cancer cell lines, and CNS inhibitory effects consistent with its use in insomnia. The formula Ban Xia Hou Po Tang has been specifically studied in clinical trials for globus sensation, nausea and anxiety.

6. Incompatibilities

The classical Ming-dynasty texts Shi Ba Fan (Eighteen Antagonisms) and Shi Jiu Wei (Nineteen Mutual Inhibitions) record herb pairs that should not be combined. Modern practitioners treat these as strong cautions rather than absolute contraindications — classical training avoids the combinations except in carefully supervised low-dose protocols.

Bàn Xià (半夏) Pinellia Rhizome should not normally be combined with:

• Fu Zi — per the Shi Ba Fan
• Chuan Wu — per the Shi Ba Fan
• Cao Wu — per the Shi Ba Fan

7. Cautions and contraindications

Raw Ban Xia is toxic and must never be used internally without processing. Only processed forms are appropriate for clinical use. Contraindicated in dry cough from Yin deficiency, and in haemoptysis. Use with caution in pregnancy (only processed Jiang Ban Xia in appropriate formulas for morning sickness). Traditional contraindication with Wu Tou (Aconite).

Pattern contraindications

Contraindicated in Yin-deficiency dry cough without phlegm. Use cautiously in bleeding disorders (some, e.g. Ban Xia, are warming and drying).

Modern drug interactions

Raw Ban Xia is toxic — only the prepared forms (Fa Ban Xia, Jiang Ban Xia, Qing Ban Xia) are used. Per classical teaching (Shi Ba Fan) not combined with Fu Zi / Chuan Wu / Cao Wu (Aconite group). Tell your GP if you take prescription medication.

Important: Chinese herbs should always be prescribed by a fully qualified herbalist who is a member of the Register of Chinese Herbal Medicine (RCHM). Never self-prescribe or self-administer Chinese herbs without professional guidance. Dr (TCM) Attilio D’Alberto is a member of the RCHM and the British Acupuncture Council with over 25 years of clinical experience.

8. Treatment at my clinic

I prescribe Bàn Xià as part of tailored herbal formulas for a range of conditions including Morning sickness, Digestive disorders, Insomnia, Tinnitus. Every prescription is individually formulated following a full TCM assessment and adjusted throughout treatment as the pattern responds.

I see patients in person at my clinic in Wokingham, Berkshire. Online Chinese herbal medicine consultations are available for patients throughout the UK and internationally, with herbs dispensed by post. Visit the prices page for consultation fees.

Return to the Chinese herb directory or the Chinese herbal medicine main page.

Prefer to be treated from home? Chinese herbal medicine online consultations are available throughout the UK and worldwide. After a full video consultation, Dr (TCM) Attilio D'Alberto formulates a bespoke herbal prescription and posts your Chinese herbs directly to your door.