Roots and rhizomesPhlegm-resolvingPinelliae Rhizoma Praeparatum

Fa Ban Xia (Alum-processed Pinellia)

Q: What is Fa Ban Xia? Are clear pinellia and ginger pinellia the same?

Official Fa Ban Xia (法半夏) is the tuber of Pinellia ternata processed with licorice and lime water . The pharmacopoeial name is Pinelliae Rhizoma Praeparatum . Clear pinellia leans to drying dampness and transforming phlegm. Ginger pinellia leans to descending counterflow and stopping vomiting. The three cannot be interchanged by equal weight. Write Fa Ban Xia. Do not use with aconite or prepared aconite.

Q: What are the TCM properties and traditional uses of Fa Ban Xia?

According to the Chinese Pharmacopoeia, Fa Ban Xia is acrid and warm , enters the Spleen, Stomach and Lung channels, and acts to dry dampness and transform phlegm . It is used for much phlegm with cough and asthma, phlegm-fluid with dizziness and palpitations, wind-phlegm dizziness, and phlegm-reversal headache. Acrid and warm, it suits damp phlegm—not yin deficiency, or absence of phlegm.

Q: What is the usual dosage? Can it be drunk daily as a phlegm tea?

The pharmacopoeial decoction dose is 3–9 g . It is not a four-season “processed-pinellia phlegm tea.” Yin deficiency only dries further as it warms. Much phlegm needs a practitioner to name a short course; it does not replace assessment.

A practical guide to Fa Ban Xia: what it is, how Traditional Chinese Medicine uses it, the classical formulas it appears in, and who should be careful with it.

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Last reviewed Oct 13, 2026

Quick Facts

Latin Name	Pinelliae Rhizoma Praeparatum
Chinese Name & Pinyin	法半夏 · Fa Ban Xia
Medicinal Part	Roots and rhizomes
The herb	Fa Ban Xia is pinellia processed with licorice and lime solution. Raw Ban Xia is toxic. Do not take it internally. Qing Ban Xia and Jiang Ban Xia are different processing. Do not combine it with aconite-type drugs.
Nature and channels	Acrid, warm. Enters the Spleen, Stomach, and Lung. Acrid warmth dries dampness and transforms phlegm.
Pharmacopoeia line	Dries dampness and transforms phlegm. Used for much-phlegm cough and wheeze, phlegm-fluid dizziness and palpitations, wind-phlegm dizziness, and phlegm-reversal headache.
Pattern cues	Much-phlegm cough and wheeze. Phlegm-fluid dizziness and palpitations. Wind-phlegm dizziness. Phlegm-reversal headache.
In this article	Fa Ban Xia versus Qing Ban Xia, Jiang Ban Xia, and raw Ban Xia. Drying dampness versus stopping vomiting. Why raw use is not appropriate. Why aconite is incompatible. Who should skip it.

What Is Fa Ban Xia?

Fa Ban Xia (法半夏; Fǎ Bàn Xià; Latin: Pinelliae Rhizoma Praeparatum; English: processed pinellia) is the processed product of Pinellia ternata (Thunb.) Breit., prepared with licorice and lime solution. In Chinese medicine it is a phlegm-transforming herb. It is acrid and warm, enters the Spleen, Stomach, and Lung channels, and its core action is to dry dampness and transform phlegm. The teaching point is much-phlegm cough and wheeze, and phlegm-fluid dizziness with palpitations. Raw Ban Xia is toxic. Do not take it raw.

It is not Qing Ban Xia. Clear-processed pinellia is stronger at drying dampness and transforming phlegm, and leans toward damp-phlegm. It is not Jiang Ban Xia. Ginger-processed pinellia is stronger at descending counterflow and stopping vomiting. Fa Ban Xia is specific for drying dampness and transforming phlegm. Warm dryness is slightly milder. Do not combine it with Chuan Wu, Zhi Chuan Wu, Cao Wu, Zhi Cao Wu, or Fu Zi. Use caution in pregnancy. Yin-deficiency dry cough, with no phlegm, is a poor match. Severe cough and wheeze, and dizziness, need a clinic.

It is used most often for three patterns:

Much-phlegm cough and wheeze — severe cases need a clinic
Phlegm-fluid dizziness and palpitations
Wind-phlegm dizziness, phlegm-reversal headache — seek care

The usual decoction dose is 3–9 g. Acrid, warm, and dry, it is not a daily “phlegm pinellia” tea. Drying when there is no damp-phlegm injures fluids.

When damp-phlegm fills the Lung, or phlegm-fluid disturbs upward, cough, wheeze, and dizzy palpitations are common. Fa Ban Xia is acrid-warm. It dries and transforms phlegm, which is why it appears in Er Chen Tang–type formulas. It warms and dries more than it moistens. A dry red tongue and a dry cough with no phlegm get drier if more is added.

Fa Ban Xia is not a catch-all dampness or phlegm tuber. In yin-deficiency dry cough, with no damp-phlegm, combined with aconite-type drugs, or in pregnancy, using it alone is a poor match. Which processing should be decided by a licensed Chinese medicine practitioner after pattern diagnosis.

Fa Ban Xia: Materia Medica Profile

Identification & Quality Standard

Pinelliae Rhizoma Praeparatum

Botanical Origin

The rhizome of Pinellia ternata (Thunb.) Breit. (Araceae) processed with alumen (Fa Ban Xia).

Production Regions

Processed throughout China from Pinellia of Sichuan, Guizhou, Anhui and Henan origin.

Quality Requirements

Superior medicinal material is thoroughly processed, white and powdery, and without a raw numbing taste.

Macroscopic Features

Sub-spherical or broken pieces, externally yellowish-white to pale yellow; fracture white and powdery; acrid taste greatly reduced compared with the raw rhizome.

Producing Regions and Quality Identification

Origin: The best quality traditionally comes from the Yangtze River basin, including Sichuan, Hubei, and Jiangsu provinces. Sichuan tubers tend to be plumper, while Hubei ones are slightly lighter in texture.
Appearance and Taste: Processed Fa Ban Xia tubers are pale yellow to brownish-yellow, appearing as small round pieces or irregular granules. They have a crisp texture, a faint licorice aroma (due to the processing), and a slightly sweet yet bitter taste.
Crucial Safety Note: Raw Ban Xia has a highly irritating odor and is toxic—chewing it will severely numb and burn your tongue and throat. It is strictly forbidden for direct internal use. Processing it into Fa Ban Xia greatly reduces this toxicity, making it safe for oral consumption.
Lookalikes: It is sometimes confused with the tubers of Tian Nan Xing (Arisaema Tuber). However, Tian Nan Xing is generally larger, has more root marks on the surface, and smells distinctly different.

Traditional Properties & Historical Lineage

Nature, Flavour & Channel Tropism

Acrid; WarmSpleenStomachLung

1. Historical Records

Shen Nong Ben Cao Jing: Listed as a middle-grade herb, it was noted for treating cold and heat conditions, throat swelling, dizziness, and coughing.
Ming Yi Bie Lu: Mentioned its ability to clear phlegm-heat in the chest, relieve coughing, and ease abdominal tension.
Ben Cao Gang Mu: Clearly outlined its core strengths: drying dampness, resolving phlegm, and descending Qi to stop vomiting.
De Pei Ben Cao: Highlighted classic pairings, such as combining it with fresh ginger for cold-phlegm issues.

2. Evolution of TCM Understanding

Historically, early doctors focused somewhat on its ability to disperse lumps and swellings for external conditions. By the Tang and Song dynasties, practitioners shifted their focus to its internal digestive benefits—specifically its power to resolve phlegm and stop vomiting. During the Ming and Qing dynasties, doctors further clarified a vital safety rule: because Fa Ban Xia is warm and drying, it should not be used by individuals suffering from Yin deficiency, dry coughs, or dehydration, preventing harmful misuse.

Core Efficacies & Traditional Applications

Traditional Functions

Dries dampness and transforms phlegm, especially cold-phlegm and damp-phlegm in the spleen and lung. Apply to cough with copious white phlegm, epigastric fullness, and nausea. Less dispersing than raw Ban Xia; toxicity reduced by alum processing.

1. Primary Focus: Drying Dampness and Resolving Phlegm

Traditional Function: Fa Ban Xia (Prepared Pinellia Rhizome) clears internal dampness and reduces excess phlegm, helping to restore smooth energy flow in the airways and body.
Common Signs: It is highly effective for "damp-phlegm" conditions, such as coughing up abundant, white, sticky, and easy-to-expectorate phlegm, accompanied by a tight chest, heavy body sensation, poor appetite, and a white, greasy tongue coating.
Common Pairings: It is frequently paired with Chen Pi (Tangerine Peel) and Fu Ling (Poria) to strengthen the spleen and tackle phlegm at its source.
When to Avoid: Do not self-prescribe if you have Yin deficiency or a dry cough (e.g., dry mouth, little to no phlegm, hot hands and feet), as its drying nature can worsen these symptoms.

2. Secondary Focus: Descending Rebellious Qi and Stopping Vomiting

Traditional Function: It guides rebellious stomach Qi downward, effectively relieving nausea and vomiting.
Common Signs: Ideal for vomiting caused by stomach cold or dampness blockages, such as nausea after eating cold foods, a cold sensation in the stomach, preferring warm drinks, and chest stuffiness.
Common Pairings: Often combined with Sheng Jiang (Fresh Ginger) or Ding Xiang (Clove) to warm the stomach and stop vomiting.
When to Avoid: Avoid using it if your vomiting is caused by stomach heat or Yin deficiency (indicated by a bitter taste, bad breath, a burning stomach, or a red tongue with yellow coating).

3. Common Single-Herb Pairing: Synergy

A classic TCM combination is Fa Ban Xia (Prepared Pinellia Rhizome) and Chen Pi (Tangerine Peel).

The Synergy: Fa Ban Xia (Prepared Pinellia Rhizome) excels at drying dampness and descending Qi, while Chen Pi (Tangerine Peel) is a master at regulating Qi and strengthening the spleen. Together, they form a powerful duo that heavily resolves phlegm, stops nausea, and clears chest stuffiness caused by dampness.
Note: This pairing requires a professional TCM diagnosis and should not be casually mixed at home.

Modern Research

Modern research offers useful context, but Traditional Chinese Medicine prescribes on whole-pattern diagnosis rather than isolated compounds.

1. Main Chemical Components

Modern scientific analysis has identified alkaloids, organic acids, volatile oils, and polysaccharides in the herb. While laboratory tests suggest some of these compounds might reduce inflammation or coughing in animals, conclusive human clinical trials are still lacking to confirm exact dosages and effects in the human body.

2. Modern Pharmacological Focus

Current lab research is mainly exploring how the herb resolves phlegm (by regulating airway secretions) and stops vomiting (by calming gastrointestinal nerves). These studies remain in the preliminary stages and require more real-world validation.

3. Limitations of Modern Research

Lab Results Aren't Clinical Proof: Success in test tubes or animal models does not automatically guarantee the same results in humans.
Extracts vs. Whole Herbs: Labs usually test highly purified, isolated chemicals. This is vastly different from the traditional, processed whole-herb decoction of Fa Ban Xia.
Inconsistent Methods: Different studies use varying extraction methods and dosages, making it difficult to form unified scientific conclusions.
Synergy is Key: In TCM, an herb's healing power comes from the complex, natural interaction of all its compounds together, not just a single isolated active ingredient.

Comparing Similar Herbs

1. Common Ground

Both Fa Ban Xia (Prepared Pinellia Rhizome) and Jiang Ban Xia (Ginger-Prepared Pinellia Rhizome) are processed forms of raw Pinellia. Both have reduced toxicity, resolve phlegm, stop vomiting, and regulate the spleen and stomach.

2. Core Differences

Nature: Fa Ban Xia (Prepared Pinellia Rhizome) is mildly warm and drying. Jiang Ban Xia (Ginger-Prepared Pinellia Rhizome) is stronger in its warming and drying nature because it is processed with ginger.
Focus of Action: Fa Ban Xia (Prepared Pinellia Rhizome) is better at resolving heavy, damp phlegm and relieving chest stuffiness. Jiang Ban Xia (Ginger-Prepared Pinellia Rhizome) is superior for warming the stomach and stopping cold-induced vomiting.
Best Used For: Choose Fa Ban Xia (Prepared Pinellia Rhizome) when you have a heavy body and a thick, greasy white tongue coating. Choose Jiang Ban Xia (Ginger-Prepared Pinellia Rhizome) for stomach cold, vomiting, and a preference for warm drinks.
Contraindications: Both should be avoided in Yin deficiency. Jiang Ban Xia (Ginger-Prepared Pinellia Rhizome) must specifically be avoided by those with internal heat or bad breath.

3. One-Sentence Summary

Fa Ban Xia (Prepared Pinellia Rhizome) is your go-to for resolving damp-phlegm and spleen dampness, while Jiang Ban Xia (Ginger-Prepared Pinellia Rhizome) is better for warming the stomach and stopping cold-induced vomiting.

Classical Formulas Containing Fa Ban Xia

Formulas vs. Single Herbs

Synergy is Key: A formula is a balanced team. The healing power comes from how the herbs interact, so a single herb cannot simply replicate a full formula's effects.
Holistic Balance: The exact dosage and combination in a formula affect the entire body. Never try to mix or alter these formulas at home based on internet articles.

Diet & Daily Home Use

1. Home Herbal Meals or Teas

Recipe: Fa Ban Xia and Chen Pi Porridge

Ingredients: 3g Fa Ban Xia (Prepared Pinellia Rhizome), 3g Chen Pi (Tangerine Peel), 50g rice.
Method: Wrap the herbs in a cheesecloth bag and boil in water for 20 minutes. Remove the herb bag, add the washed rice to the water, and cook until it becomes a soft porridge.
Best for: Summer dampness causing chest stuffiness, excessive phlegm, and nausea.
Usage: Eat 1 to 2 times a week. Do not consume long-term.
Warning: Avoid if you have Yin deficiency (dry mouth, dry cough) or are pregnant. Always use medicinal-grade herbs and consult a professional first.

2. Decoction and Processing Differences

Safety: While processing heavily reduces its toxicity, Fa Ban Xia (Prepared Pinellia Rhizome) should still never be chewed raw or used directly as a regular food ingredient.
Brewing: It does not require special boiling times (like pre-boiling or adding late). You can decoct it normally with other herbs.
Dosage Conversion: Never use a clinical prescription dose for your daily tea or porridge.

3. Dosage and Usage Cycle

Clinical Dose: Usually 3 to 10 grams, tailored by a doctor.
Dietary Dose: Keep it strictly under 3 grams for culinary use.
Cycle: Take breaks; do not use continuously. Vulnerable groups must consult a doctor before any use.

Contraindications & Safety Warnings

1. Who Should Avoid It

Specific Constitutions: People with Yin deficiency, dry coughs, severe thirst, or bleeding tendencies (like vomiting blood or blood in stool) should avoid it, as it is very drying.
Pregnancy and Nursing: Always consult a physician, as special care is required.
Seniors and Children: Weaker organ functions mean they cannot tolerate the herb's properties without strict medical supervision.
Organ Issues: Those with abnormal liver or kidney function should use it with extreme caution.
Allergy Risks: Avoid if you are allergic to plants in the Araceae family.

2. Drug Interactions and Dietary Notes

Medications: It may interact with blood thinners, blood pressure/sugar meds, and sedatives. Because it affects the stomach, it can alter how other drugs are absorbed. Always space it 1 to 2 hours apart from Western medications.
Diet: Avoid eating too much spicy, greasy, or cold/raw food while taking it, as these can increase internal dampness or dryness and ruin the herb's effects.

3. Adverse Reactions and Overdose Risks

Side Effects: Though processed for safety, some may experience dry mouth, mild stomach discomfort, or constipation.
Emergency: Stop use immediately and seek medical care if you experience allergic reactions (hives, breathing difficulties), persistent vomiting, mental confusion, or a rapid worsening of symptoms.

Frequently Asked Questions About Fa Ban Xia

What is Fa Ban Xia? Are clear pinellia and ginger pinellia the same?

Official Fa Ban Xia (法半夏) is the tuber of Pinellia ternata processed with licorice and lime water. The pharmacopoeial name is Pinelliae Rhizoma Praeparatum. Clear pinellia leans to drying dampness and transforming phlegm. Ginger pinellia leans to descending counterflow and stopping vomiting. The three cannot be interchanged by equal weight. Write Fa Ban Xia. Do not use with aconite or prepared aconite.

What are the TCM properties and traditional uses of Fa Ban Xia?

According to the Chinese Pharmacopoeia, Fa Ban Xia is acrid and warm, enters the Spleen, Stomach and Lung channels, and acts to dry dampness and transform phlegm. It is used for much phlegm with cough and asthma, phlegm-fluid with dizziness and palpitations, wind-phlegm dizziness, and phlegm-reversal headache. Acrid and warm, it suits damp phlegm—not yin deficiency, or absence of phlegm.

How do you choose Fa Ban Xia versus clear pinellia? Can ginger pinellia replace it?

Fa Ban Xia leans to drying dampness and transforming phlegm. Clear pinellia also dries dampness. Ginger pinellia leans to descending counterflow and stopping vomiting; it cannot replace drying dampness by equal weight. Commercial processed-pinellia tea is not equal-weight pieces.

What is the usual dosage? Can it be drunk daily as a phlegm tea?

The pharmacopoeial decoction dose is 3–9 g. It is not a four-season “processed-pinellia phlegm tea.” Yin deficiency only dries further as it warms. Much phlegm needs a practitioner to name a short course; it does not replace assessment.

What are the contraindications? Can it be used in pregnancy?

Do not use with chuan wu, prepared chuan wu, cao wu, prepared cao wu or aconite. Use caution in yin deficiency. Pregnancy needs a practitioner’s assessment. Stop if dry mouth or throat pain appears. Much phlegm and dizziness need medical care.

Can Fa Ban Xia dry dampness and transform phlegm?

It can help damp phlegm with cough and asthma and wind-phlegm dizziness. It joins tangerine peel and poria in an Er Chen Tang type modification. It dries dampness and transforms phlegm—not a specific for every much phlegm or every dizziness.

Can Fa Ban Xia be drunk daily as a phlegm or cough tea?

Damp phlegm may enter a short formula; yin deficiency only dries further as it warms. “Processed pinellia must transform phlegm” does not replace assessment. Drying dampness and transforming phlegm should name 3–9 g.

How do you choose among Fa Ban Xia, clear pinellia, ginger pinellia, tangerine peel and poria?

Processed pinellia is acrid-warm: dries dampness and transforms phlegm—damp phlegm with cough and asthma. Clear pinellia is acrid-warm: dries dampness and transforms phlegm, leaning to clear. Ginger pinellia is acrid-warm: descends counterflow and stops vomiting—phlegm-fluid with vomiting. Tangerine peel is acrid-bitter and warm: regulates qi, strengthens the Spleen, dries dampness and transforms phlegm—qi stagnation. Poria is sweet-bland and neutral: drains water, percolates dampness and strengthens the Spleen—Spleen vacuity with dampness. Damp phlegm favors Fa Ban Xia; clear favors clear pinellia; vomiting favors ginger pinellia; qi stagnation favors tangerine peel; Spleen vacuity favors poria. They may be paired after pattern differentiation; yin deficiency forbids large Fa Ban Xia and ginger pinellia, and they must not be used with aconite or prepared aconite.

Which herbs is Fa Ban Xia combined with? What are the representative formulas?

Damp phlegm with cough and asthma joins tangerine peel, poria and licorice in an Er Chen Tang type modification. Write Fa Ban Xia 3–9 g; do not replace drying dampness with ginger pinellia by equal weight.

How do you choose and store Fa Ban Xia?

Choose nearly spherical or granular pieces, a pale yellow-white or yellow-brown surface, loose brittle or hard brittle texture, a yellow or pale yellow cut surface, a faint odor and a bland slightly sweet taste with slight tongue numbness. Moldy, dirty or non-numbing lots are discarded. Store dry, protected from insects. Buy pharmacopoeial Fa Ban Xia; do not replace drying dampness and transforming phlegm with clear pinellia or ginger pinellia by equal weight.

Related Products

Nong's Fa Ban Xia (Processed Pinellia) Single Herb 5:1 Concentrated Granules $114.62

Medical Disclaimer — This article is provided for educational purposes only and describes traditional Chinese medicine concepts. It is not medical advice, and it is not intended to diagnose, treat, cure or prevent any disease. Always consult a qualified practitioner before using any herb, particularly if you are pregnant, nursing, taking medication or managing a diagnosed condition.