Pinellia ternata (Ban Xia): A Comprehensive Reference
1. Identity and Botanical Characterization
Nomenclature and Taxonomy
The rhizome of Pinellia ternata (Thunb.) Breit, called Pinelliae Rhizoma (PR) or Banxia in China, belongs to the family Araceae. The full accepted botanical name is Pinellia ternata (Thunberg) Breitenbach, and the drug material derived from it is referred to in pharmacopeial literature as Pinelliae Rhizoma (abbreviated PR or PTT for "Pinellia ternata tuber"). The dried tuber of Pinellia ternata (Thunb.) Breit, also named Banxia in Chinese, is widely used in traditional medicine. Additional common names include ban xia (Chinese, 半夏), and in Japanese Kampo medicine the drug is referred to as Hange. The dried tuber of this herb, called "banxia" in Chinese, is in the top 10 most commonly used traditional Chinese medicines.
Natural Source and Distribution
Pinellia ternata (Thunb.) Druce is a perennial herb, and the tuber and bulbil have been widely used in traditional medicine.
Pinellia ternata, a perennial herbal plant, is widely distributed in China, Japan, Korea and other countries in East Asia.
It also grows as a weed in Europe and North America.
Plant Morphology and the Medicinal Part
The plant produces a small underground tuber or rhizome, which is the part used medicinally in all traditions.
An underground part called a tuber is used to make medicine.
The tuber and bulbil of P. ternata contain a large number of alkaloids, which are the main active ingredients used for medicinal applications.
With the increasing demand for P. ternata, it is becoming more difficult to obtain sufficient amounts to meet the huge demand, and over-exploitation of P. ternata makes these wild resources on the verge of extinction. The wild resources of P. ternata are widely distributed in East Asia and it is cultivated artificially in many areas in China.
Commercial and Pharmacopeial Forms
The toxicity and side effects of raw Pinellia ternata tuber (RPTT) can be dramatically reduced with proper processing and dose control. Three kinds of processed PTT with different traditional processing methods are available and traded in market, as well as applied in clinical treatments: alum-processed Pinellia ternata tuber (APTT, Qing Ban Xia in Chinese), ginger-alum-processed Pinellia ternata tuber (GPTT, Jiang Ban Xia in Chinese), and liquorice-limewater-processed Pinellia ternata tuber (LPTT, Fa Ban Xia in Chinese).
A less common form also exists. Zhu Li Ban Xia is a less common form, processed with bamboo sap to reduce its warm, drying qualities, for use with hot conditions.
According to the Chinese Pharmacopoeia, Pinellia was first registered in the 1st edition, published in 1953, as the name of "Pinellia". However, there were no descriptions about the processing. The 2nd edition, published in 1963, registered the item as "Rhizoma Pinelliae," and the sub-items of processed PT as processed preparations.
In the Chinese Pharmacopoeia 2005 edition, processed forms were separated as independent items from the raw drug.
The Japanese Pharmacopoeia has registered PT since 1939 without any processing.
2. Traditional and Historical Use
First Recorded Use and Core Texts
Pinellia ternata tuber (PT) has a long history of clinical application in China. It was first recorded in Shen Nong's Herbal Classic (Shen Nong Ben Cao Jing), published approximately 2,000 years ago.
It was first recorded in Shen Nong Ben Cao Jing (Shen Nong's herbal classic), a book of 2,000 years ago. PR is commonly used in traditional Chinese medicine (TCM) prescriptions to manage cough, phlegm, vomiting, and cancer.
It has also been stated that PT has "toxicity" since the ancient TCM literature Miscellaneous Records of Famous Physicians, published around 2,000 years ago.
Traditional Chinese Medicine (TCM)
Pinellia ternata tuber (PTT), the dried tuber of Pinellia ternata (Thunb.) Breit., has a long history of use in traditional Chinese medicine for drying dampness, resolving phlegm, down-bearing counterflow to check vomiting, and dissipating masses.
Within TCM theory, the drug occupies a specific categorical identity. Ban Xia (Pinellia ternata), commonly known as Prepared Pinellia Rhizome, is a key phlegm-transforming and dampness-drying herb in TCM. For centuries, it has been valued for its ability to dry dampness, transform phlegm, and direct rebellious Qi downward. Historically, Pinellia ternata has been employed for its purported effects on respiratory and digestive health, featuring prominently in classical formulations such as Banxia Houpo Tang and Er Chen Tang.
The concept of processing evolved substantially over the dynasties. Descriptions about the processing of PT in China had appeared since the Later Han dynasty as washing, and after that, various processing methods were recorded, such as boiling, steaming, making cakes, and fermenting to prepare PT malt (PTM) with various drug additives. The objective of the processing for PT was not only to remove its toxicity but to change drug properties, and several kinds of processed PT were developed to treat different types of "phlegm" in the Ming dynasty.
Japanese Kampo Medicine
Pinellia Tuber is a crude drug used in traditional Chinese medicine (TCM) and Japanese Kampo medicine. PT is subjected to additional processing before use in TCM because of its toxicity, while the processing has not been used in Kampo medicine.
In 1738, Shuan Kagawa wrote that PT should not be processed because its pharmacological effects disappeared and the toxicity of PT disappeared by preparing its decoction without processing. Then, the processing of PT became unpopular, and the Japanese Pharmacopoeia has registered PT since 1939 without any processing. Compared to TCM, Japanese Kampo medicine has tended to avoid ideologism based on traditional knowledge and to adopt positivism. This policy reflected the differences in the processing of PT between Kampo medicine and TCM.
Traditional Processing Methods in Detail
The processing methods used traditionally include: (1) Jiang Ban Xia: boiled in ginger and alum, enhancing the effects of resolving phlegm and stopping vomiting; (2) Fa Ban Xia: soaked long-term in liquorice extract and lime, enhancing the effect of drying dampness and resolving phlegm; (3) Qing Ban Xia: soaked long-term in alum, enhancing the effect of resolving phlegm; (4) Zhu Li Ban Xia: a less common form, processed with bamboo sap to reduce its warm, drying qualities, for use with hot conditions. Japanese Kampo medicine has traditionally not prepared pinellia, believing that processing not only reduces its toxicity but also its efficacy.
Scope of Traditional Therapeutic Applications
P. ternata has long been used to treat diseases such as cough, vomiting, inflammation, epilepsy, cancer, and traumatic injuries.
Pinellia ternata Breitenbach (PTB) is one of the main ingredients in traditional herbal medicine and has been used for antiemetic, antitussive, anti-inflammatory, and sedative purposes since ancient times.
3. Key Constituents and Active Compounds
Overview of Chemical Diversity
Approximately 212 chemical constituents have been isolated from Pinellia ternata, including alkaloids, volatile oils, amino acids, organic acids, flavonoids, cerebrosides, phenylpropanoids, and other compounds.
Pharmacological ingredients from PR are mainly classified into six categories: alkaloids, amino acids, polysaccharides, phenylpropanoids, essential oils, and glucocerebrosides.
Alkaloids
Secondary metabolites of P. ternata have been identified: alkaloids (the main active ingredient, including ephedrine), organic acids, volatile oils, sterols, and amino acids.
Alkaloids are the major active components in both cultured (0.48%) and planted (0.14%) Pinellia plants.
A total of 40 alkaloids, including nucleoside alkaloids, cyclic dipeptide alkaloids, and indole alkaloids, were isolated from Pinellia species.
Among alkaloids, ephedrine is particularly significant. Alkaloids are the main active ingredient, including ephedrine, and ephedrine accumulates primarily in mature tubers and is of great interest to researchers. Ephedrine and other phenylpropylamino alkaloids, such as (1S,2S)-pseudoephedrine, (S)-cathinone, (1R,2S)-norephedrine, and (1S,2S)-pseudonorephedrine, are particularly noted.
Other Major Phytochemical Classes
In PR, different types of chemical compounds, including alkaloids, amino acids, phenylpropanoids, volatile oils, and lectins, are considered to be pharmacological and/or toxicological constituents.
Except for large amounts of starches, the tuber of P. ternata also contains plenty of diverse phytochemicals including organic acids, nucleosides, flavonoids, alkaloids, and so on.
A notable antimicrobial compound has also been characterized from this plant. Pinelloside, an antimicrobial cerebroside, has been isolated from Pinellia ternata and characterized by Chen et al. (2003).
The tubers of P. ternata contain abundant bioactive substances, such as alkaloids, β-sitosterol, and flavonoids, and the plant is widely used in medicine due to its anti-depression, wound healing, antitussive, and antiemetic effects.
Toxic Constituents
Raw PR has irritant, teratogenic, carcinogenic, mutagenic, and reproductive toxicities. Needle-like calcium oxalate crystals, lectin, and protocatechualdehyde have been considered as the possible toxic substances of PR.
Pinellia tuber contains needle-shaped crystals made of calcium oxalate, and the acridity may be caused by these needles puncturing the cell membrane of the throat epithelial cells. After processing, the structure of the crystals changes and their content decreases, leading to a significant reduction in acridity. Recent studies have shown that acridity is caused by insoluble needle-like raphides, which are composed of calcium oxalate and proteins.
A study using a rabbit eye model confirmed this mechanism: calcium oxalate crystals in raw P. ternata showed very strong irritation property.
Incubating raphides with dried ginger extract significantly reduced the amount of Pinellia ternata lectin (PTL) in the raphides in a concentration-dependent manner. By activity-guided fractionation of ginger extract, the active ingredients were oxalic acid, tartaric acid, malic acid, and citric acid. Among these four organic acids, oxalic acid mainly contributed to the detoxification effect.
4. Established Mechanisms of Action
Antiemetic Mechanisms
Pinellia ternata Breitenbach (PTB) is a widely used herbal medicine in China, Japan, and South Korea. It has antiemetic, anti-inflammatory, antitussive, and sedative properties.
The antiemetic action has been partially characterized at the neurophysiological level. A 1993 study by Niijima et al. examined the effect of Pinellia ternata tuber on the efferent activity of the gastric vagus nerve in the rat, published in Brain Research Bulletin, suggesting a vagal pathway of action.
Network pharmacology studies have further mapped the molecular interactions. PTB seems to be effective for gastrointestinal motility disorders (GMDs), though this is yet to be conclusively proven. PTB compounds, targets, and related diseases were investigated using the traditional Chinese medical systems pharmacology database and an analysis platform. The effects of the PTB extract on the pacemaker potential of interstitial cells of Cajal and GMD mouse models were investigated. In total, 12 compounds were found to target 13 GMD-related genes.
Antitumor Mechanisms
The pharmacological compounds are involved in inhibition of cancer cells by targeting various pathways, including activation of the immune system, inhibition of proliferation and cycle, induction of apoptosis, and inhibition of angiogenesis.
The alkaloids from five processed P. ternata products have significant cytotoxicity against chronic myeloid leukemia cells (K562). Compared with the negative control group, the doses of 400, 200, and 100 μg/mL of P. ternata alkaloids inhibited the cell proliferation of human hepatocarcinoma cell strain Bel-740 by 36.98%, 15.20%, and 12.97%, respectively. These findings are from in vitro models only.
Broad Pharmacological Profile Established in Preclinical Research
Modern pharmacology studies have revealed that PTT has diverse pharmacological effects such as antitussive and expectorant, anti-emetic, anti-tumor, and anti-inflammatory effects.
The extensive range of pharmacological effects includes antitussive, expectorant, antiemetic, antitumor, antibacterial, anti-fungal, anti-inflammatory, as well as sedative-hypnotic activities.
PR extracts possess multiple pharmacological and clinical effects, such as anti-depressant, expectorant, antitumor, anti-inflammation, antiemetic, and wound-healing.
5. Scientific Evidence by Area of Use
5.1 Chemotherapy-Induced Nausea and Vomiting (CINV)
The formula Xiao Ban Xia Tang (XBXT), consisting of Pinellia ternata (Banxia) and fresh ginger (Shengjiang), is the best-studied Pinellia-containing preparation for CINV.
The TCM prescription XBXT has the characteristics of multi-target, wide curative effect, and small side effects, making up for the deficiency of antiemetic drugs at present. The Chinese herbal formula, XBXT, is derived from the Synopsis of Golden Chamber written by Zhongjing Zhang during the Han Dynasty, which can downbear counterflow and check vomiting.
A 2024 systematic review and meta-analysis published in Frontiers in Pharmacology (PMC11199399) evaluated the clinical evidence formally:
The systematic search was conducted in eight databases to acquire randomized controlled trials (RCTs) that appraised the effect of XBXT in treating CINV. The vomiting and nausea relief efficiency, eating efficiency, quality of life, and adverse reactions were explored for efficacy assessment. Bias risk was rated by using the Cochrane risk of bias tool 2.0 (RoB 2). Retrieved investigations were analyzed using ReviewManager 5.4 and Stata 17.0. The quality of evidence was evaluated using the GRADE tool.
A total of 16 clinical RCTs of XBXT in the treatment of CINV were incorporated into the investigation, with a total of 1,246 participants.
The meta-analysis showed that compared with conventional antiemetic drugs, XBXT combined with antiemetics improved the vomiting relief efficiency (RR 1.35, 95% CI: 1.25–1.46, p < 0.00001) and nausea relief efficiency.
Evidence strength: The body of clinical evidence for XBXT in CINV is based on 16 RCTs involving 1,246 patients and shows statistically significant benefit over standard antiemetics alone. However, most included trials were conducted in China and the overall quality of evidence as rated by GRADE requires cautious interpretation, and independent replication outside of China is limited.
5.2 Nausea and Vomiting (General Antiemetic Activity)
The medicinal herb, Pinellia ternata, is purported to be an anti-emetic with analgesic and sedative effects. Alkaloids are the main biologically active compounds in P. ternata.
Animal mechanistic data suggest that Pinellia ternata tuber modulates the gastric vagus nerve, providing a physiological basis for its traditional antiemetic use. Preclinical studies in rats have demonstrated reduction of chemotherapy-induced pica (a proxy measure of nausea). Broader human clinical data specifically on the isolated herb for non-CINV nausea remain limited.
5.3 Respiratory Conditions: Cough and Expectoration
Considerable pharmacological experiments in vitro and in vivo have demonstrated that Pinellia ternata possesses antitussive effects, antiasthmatic effects, and increasing resistance to gastric ulcer.
Some animal and in vitro studies report potential benefits in modulating immune responses and reducing airway inflammation, supporting traditional claims of its use for respiratory conditions. Clinical validation in humans, however, remains limited. A few small-scale clinical studies have evaluated formulations containing Pinellia ternata for conditions such as chronic bronchitis and chemotherapy-induced nausea, with some positive outcomes reported.
Evidence strength: Antitussive and expectorant effects are consistently demonstrated in animal and in vitro models. Robust human clinical trial evidence for isolated Pinellia ternata preparations in respiratory disease remains sparse.
5.4 Gastrointestinal Motility Disorders
PTB seems to be effective for gastrointestinal motility disorders (GMDs), but this is yet to be conclusively proven. A 2022 network pharmacology and animal model study published in Plants (PMC9145079) identified 12 compounds from PTB targeting 13 GMD-related genes. The study also tested PTB extracts on pacemaker potential of interstitial cells of Cajal and evaluated therapeutic effects in mouse models of GMDs.
Evidence strength: Network pharmacology and mouse model data provide mechanistic and preliminary in vivo support, but controlled human trials specifically for gastrointestinal motility disorders have not been identified in the peer-reviewed literature searched.
5.5 Antitumor / Anticancer Activity
The medicinal plant Pinellia ternata has been widely used in China, Korea, and Japan and has been demonstrated to be highly effective for treating cough, vomiting, infection, and inflammatory diseases. Modern pharmacological investigations have demonstrated its multiple activities, such as antitussive, expectorant, antiemetic, antitumor, antibacterial, and sedative-hypnotic activities.
The alkaloids isolated from the tubers of P. ternata are said to have anticancer properties. A network pharmacology and metabolomics study published in BMC Complementary Medicine and Therapies (2024) investigated the mechanisms by which Pinellia ternata may inhibit non-small cell lung cancer cells, identifying multiple active compounds and their pathways.
Evidence strength: Antitumor activity is established in in vitro cell line models and some animal studies, including data on K562 leukemia cells and hepatocarcinoma cell lines. There are no published randomized controlled trials testing Pinellia ternata as a standalone anticancer agent in humans. All current antitumor evidence is preclinical.
5.6 Depression and Neuropsychiatric Conditions
The formula Banxia Houpo Tang (BHT), which contains Pinellia ternata as a key constituent, has been studied for antidepressant effects.
A meta-analysis that included 23 studies indicated that BHT considerably reduced immobility time in the forced swim test (SMD = −2.89, 95% CI: −3.92 to −1.87, P < 0.00001). However, this meta-analysis covered predominantly animal studies (the forced swim test is a rodent model of depression), and the findings regarding CHM in combination with antidepressants suggest a potential adjunctive role.
Banxia Houpu Tang combined with citalopram has been reported to be effective and rapid in the treatment of patients with postpartum depression, performing better than citalopram alone in small human trials.
Evidence strength: The available evidence for Banxia Houpo Tang in depression consists mostly of animal model studies; the few human clinical reports involve small samples and are of limited methodological quality. The contribution of Pinellia ternata specifically, versus the other formula constituents, cannot be isolated from these studies.
5.7 Gastric Ulcer
Pinellia ternata and its compound preparations can be used for cough, vomiting, and gastric ulcer. It is drawing worldwide interest in medicinal applications including anti-gastric ulcer effects. Preclinical data demonstrate protection against experimental gastric ulcers, but human clinical trial data specifically for this indication are not found in the reviewed literature.
6. Body Systems and Health Areas of Association
- Gastrointestinal system: Pinellia ternata and its compound preparations can be used for cough, vomiting, and gastric ulcer. Traditional antiemetic use is supported by both in vivo mechanistic data and clinical RCT meta-analyses (within XBXT formulas).
- Respiratory system: In traditional Chinese medicine (TCM), PT has expectorant and anti-nausea effects for the management of cough. Multiple pharmacological studies confirm antitussive and expectorant activity in animals.
- Central nervous system / neuropsychiatric: It has antiemetic, anti-inflammatory, antitussive, and sedative properties. Traditional use for insomnia and anxiety (within multi-herb formulas) is supported by animal data; robust human evidence is lacking.
- Oncology (preclinical): The pharmacological compounds are involved in inhibition of cancer cells by targeting various pathways, including activation of the immune system, inhibition of proliferation and cycle, induction of apoptosis, and inhibition of angiogenesis.
- Anti-inflammatory: Anti-inflammatory activity is consistently reported across preclinical studies and forms part of the mechanistic basis for several of its traditional applications.
7. Dosage Forms and Dosages Reported in Studies
The current Chinese Pharmacopoeia recommends the use of processed PT to avoid toxicity, and registers unprocessed PT as well as three kinds of processed PT.
In the clinical context of the XBXT meta-analysis encompassing 16 RCTs and 1,246 participants, Pinellia ternata (as Banxia) was used as an oral decoction combined with fresh ginger, with dosing varying across individual trials as reported in the individual RCTs compiled by Li et al. (2024, Frontiers in Pharmacology). Specific gram dosages for each trial arm were not uniformly reported in the meta-analysis abstract and methods; readers should consult the primary trial publications for individual study dosages.
In the in vitro antitumor studies cited above, doses of 400, 200, and 100 μg/mL of P. ternata alkaloids were used and inhibited cell proliferation of human hepatocarcinoma cell strain Bel-740 by 36.98%, 15.20%, and 12.97%, respectively. These are cell culture concentrations only.
The raw material is toxic, but can be made safer using alum solution or by boiling it for a long time. Traditional decoction-based use in TCM clinical practice employs processed forms almost exclusively.
8. Safety Considerations and Drug Interactions
Intrinsic Toxicity of Raw Material
PR also has toxicities. In animals, the powder or extract of raw PR demonstrates acute toxicity, and excessive or long-term use of this herb can cause organ injuries. In addition, raw PR has irritant, teratogenic, carcinogenic, mutagenic, and reproductive toxicities.
When raw PT is orally administered, symptoms of sharp tingling in the lips and pain in the mouth and throat are apparent. A previous study indicated that this strong irritation has been attributed to the needle-like crystals of calcium oxalate, called raphides.
Unprocessed Pinellia ternata has toxic effects, with common symptoms including stinging sensations in the throat and mouth and induction of vomiting and miscarriage.
Regulatory Status in the United States
Since April 2004, Pinellia ternata has been banned in the US because it contains chemicals called ephedrine alkaloids. These chemicals might cause serious side effects such as heart attack, stroke, or seizures. The ban does not apply to traditional Asian medicines containing this ingredient.
The US Food and Drug Administration has banned ephedra-containing supplements. In addition, dietary supplements that contain ephedrine are illegal in the United States for their serious side effects.
Ephedrine Content and Cardiovascular Risk
Alkaloids are the main biologically active compounds in P. ternata, especially ephedrine, a phenylpropylamino alkaloid.
It contains a stimulant called ephedrine. Ephedrine might cause serious side effects such as heart attack, stroke, or seizures.
CYP3A Inhibition and Drug–Drug Interactions
Research results revealed that drug interaction between Pinelliae Rhizoma and the CYP3A-metabolizing drugs might be probable, suggesting that careful monitoring is essential for the concomitant use of PR with other drugs to avoid adverse interactions.
At least 20 chemotherapy drugs could be affected by pinellia, including doxorubicin, vinblastine, vincristine, cyclophosphamide, tamoxifen, and paclitaxel.
CYP3A, the most abundant P450 enzyme in the liver, is involved in the metabolism of 40% to 50% of all currently used drugs. Inhibition of this enzyme by Pinelliae Rhizoma, as demonstrated in rat studies, thus carries the potential for clinically relevant pharmacokinetic interactions with a broad range of co-administered pharmaceuticals.
Sedative Interaction Potential
Pinellia ternata might cause sleepiness and drowsiness. Medications that cause sleepiness are called sedatives. Co-administration with central nervous system depressants may therefore produce additive effects.
Reproductive and Teratogenic Concerns
Raw PR has irritant, teratogenic, carcinogenic, mutagenic, and reproductive toxicities. This toxicity profile is based on animal data and the documented abortifacient effects observed with unprocessed material. Miscarriage has been reported as a toxic effect of unprocessed Pinellia ternata in historical and pharmacological literature.
Occupational and Allergic Hazards
IgE-mediated occupational asthma induced by the herbal medicine Bahna (Pinellia ternata) has been documented (Kim SH et al., Clinical and Experimental Allergy, 2000;31:779–781), indicating potential for immune-mediated hypersensitivity reactions from occupational exposure to the herb.
Processing Reduces but Does Not Eliminate Risk
Products used in traditional Asian medicine use Pinellia ternata tuber that has been processed to remove sharp crystals that can irritate the mouth, throat, and gut.
During the processing of PPT, immersion in licorice juice and limewater can destroy the structure of the raphides and reduce the amount of lectin protein. While processing substantially reduces irritant and toxic constituents, it does not eliminate alkaloid content or the drug-interaction potential mediated through CYP3A.
References
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