Bàn Xià · Pinellia Rhizome
Bàn Xià (半夏, Pinellia Rhizome) is a herb of Warm nature and Pungent flavor, in the “Phlegm-transforming herbs” category. Tradition uses it to dry Dampness, Transform Phlegm, Descend Rebellious Qi.
Energetic profile
- Pinyin name
- Bàn Xià
- Characters
- 半夏
- Botanical name
- Pinellia ternata (Thunb.) Ten. ex Breitenb.
- Family
- Araceae
- Part used
- Rhizome (processed)
- Nature
- Warm
- Flavor
- Pungent
- Meridians
- Lung, Spleen, Stomach
- Category
- Phlegm-transforming herbs
- Toxicity
- Slightly toxic
- Pregnancy
- Avoid
- Origin
- China
Actions according to tradition
- Dry Dampness
- Transform Phlegm
- Descend Rebellious Qi
- Stop Vomiting
Traditional uses
- Phlegm-cold cough with copious white sputum
- Nausea and vomiting from cold-phlegm in stomach
- Chest fullness and palpitations from phlegm-water
- Goiter, nodules, and phlegm masses
- Insomnia from disharmony of stomach
Studied effects and current applications
- Powerfully dries dampness and transforms phlegm-cold
- Stops nausea and vomiting by descending stomach qi
- Dissipates nodules and masses from phlegm stagnation
- Opens chest oppression from phlegm-cold
- Reduces swelling and alleviates pain topically
Applications under investigation
- Nausea of pregnancy and chemotherapy
- Respiratory conditions with excess mucus
- GERD and gastritis
- Thyroid nodules
- Vertigo from phlegm-damp
An effect being investigated does not mean it has been proven in humans.
Contraindications and adverse effects
Absolute contraindications
- Pregnancy
- Bleeding disorders
- Hemorrhagic conditions
- RAW form (toxic)
Relative contraindications
- Yin deficiency with dry cough
- Excessive thirst from heat damaging fluids
- Pregnancy
- Absolutely contraindicated in pregnancy. Strongly emmenagogue and teratogenic.
- Breastfeeding
- Avoid during breastfeeding due to toxicity.
- Children
- Only use properly processed form (Zhi Ban Xia). Reduce doses. Monitor carefully.
- Older adults
- Use processed form only. Reduce dose in elderly with yin deficiency.
Possible adverse effects
- Throat irritation (especially raw form)
- Nausea
- Numbness of tongue and throat (toxicity sign)
When to stop
- Any sign of toxicity (numbness)
- Worsening of dry cough
- Pregnancy suspected
Interactions with medications
| Group | Drugs | Severity | Effect and recommendation |
|---|---|---|---|
| Antacids and GI medications | Omeprazole, Metoclopramide | Mild | Additive antiemetic effects Monitor for excessive sedation of GI tract |
| CNS depressants | Benzodiazepines, Antihistamines | Mild | Possible additive sedative effect Monitor sedation level |
With other herbs
- ginger Ginger detoxifies Ban Xia toxicity and enhances antiemetic effect
- licorice Incompatibility noted in classical texts - reduces efficacy
Reference dose
- Decoction
- 3-9 grams daily (processed only)
- Powder
- 1-3 grams daily (processed)
- Acute use
- 1-2 weeks
- Chronic use
- 3-4 weeks with medical supervision
- Maximum
- Short-term use preferred
- Children
- Only use processed Ban Xia (Zhi Ban Xia) in children. Must be processed to remove toxicity.
Forms of preparation
Use only properly processed form. Simmer 3-9g 30-45 min. Never use raw.
Phlegm, nausea, cough
Use Jiang Ban Xia (ginger-processed) for nausea and vomiting specifically.
Nausea and vomiting
Approximate doses from the literature; they are not a prescription. Consult a professional.
Active compounds
Alkaloids (ephedrine absent), beta-sitosterol and succinic acid (processed)
Phytosterol glucoside · Anti-inflammatory, immunomodulatory, antitumor
NF-κB inhibition, Th1 immune response modulation · 0.05-0.2%
Biogenic amine and phenol · Antiemetic, secretolytic
Peripheral cholinergic modulation, reduction of gastric acid secretion · variable
dicarboxylic acids · Anti-inflammatory, antiemetic
Inhibition of prostaglandin synthesis · Present in processed form
Polysaccharides · Mucous membrane protector, expectorant
Physical protection of mucosa, lubrication of respiratory tract · Variable in preparations
Harvesting and processing
- Harvest
- Summer-autumn (July-September)
Tubers harvested when the aerial parts begin to yellow. PROCESSING REQUIRED: The raw tuber contains calcium oxalate crystals that cause severe mucosal irritation, laryngeal edema, and vomiting. NEVER use raw internally.
WARNING: The raw form causes severe irritation of oral and pharyngeal mucosa, glottis edema, aphasia and vomiting. It is TOXIC for internal consumption without processing. Only occasional external use for abscesses.
DETOXIFICATION: Tubers soaked in water for 7-10 days, changing the water daily until they no longer cause itching. Then cooked with ginger (25 g per kg) and alum (12.5 g/kg) until completely penetrated. Dried and cut.
Tubers soaked in alkaline water (slaked lime) and then in licorice decoction, alternating for several days. Official method of the Chinese Pharmacopoeia. Softer and drier than the ginger version.
Mixed with bamboo juice (竹沥 Zhú Lì) and processed. Bamboo adds cooling properties.
Formulas it appears in
Health notice. Educational and study content. It describes concepts of Traditional Chinese Medicine and does not replace diagnosis or treatment by a healthcare professional. Needling, medicinal herbs and invasive techniques must be applied by trained professionals. Safety guide.
