Da Fu Pi
StarAreca catechu L.
Traditionally used for
- Digestion
- Urinary & fluids
☯ TCM Properties
Directs Qi downward and eases the middle; Moves Qi and Relieves Distension; Promotes Urination and Reduces Edema; Drains Dampness
Traditional Chinese Uses
Da Fu Pi (areca peel, betel nut husk) is a warm herb used in Chinese medicine to move Qi downward and promote urination to reduce fluid retention. It relieves abdominal bloating, distension, and heaviness from Qi stagnation and Dampness — particularly in the digestive tract — and its mild diuretic action drains excess fluid from the tissues. As a Qi-regulating and water-draining herb, it is commonly included in formulas for the combined pattern of Qi stagnation with fluid accumulation.
Western Herbalism Properties
Used In Formulas (13)
Relationships
Full-screen graph →Click a node for details · double-click to expand it · Ctrl/⌘ + scroll or two fingers to zoom and pan.
Botanical Description
Areca catechu L. (Arecaceae), the betel-nut palm, is a slender unbranched feather palm 10-20 m tall with a smooth ringed trunk and a crown of pinnate fronds 1.5-2 m long. The orange-red ovoid drupes 5-7 cm long contain a single hard seed enclosed in a fibrous pericarp. Da Fu Pi is the dried mature pericarp (mesocarp and endocarp fibers) of the fruit, separated from the seed, torn into pieces, and sun-dried. In TCM, Da Fu Pi is acrid in flavor and slightly warm in nature, entering the Spleen, Stomach, Small Intestine, and Large Intestine channels; it moves qi downward, reduces food stagnation, promotes urination, and relieves edema, particularly water accumulation with abdominal distention.
Active Constituents
Arecaidine
Pyridine (tetrahydronicotinic acid) alkaloidConcentration: 0.010-0.032% of the dried pericarp across 10 batches, versus 0.020-0.045% in the seed (Tian et al., 2018)
The N-demethylated hydrolysis product of arecoline and, with guvacine, one of only two alkaloids consistently detectable in the pericarp. It is a poor muscarinic agonist compared with arecoline but a potent inhibitor of GABA uptake. Because arecoline is absent from most pericarp batches, arecaidine and guvacine are the alkaloids proposed as quality-control markers for this drug.
Guvacine
Pyridine alkaloidConcentration: 0.006-0.029% of the dried pericarp, versus 0.031-0.086% in the seed (Tian et al., 2018)
A selective inhibitor of the GAT-1 GABA transporter in vitro. It penetrates the central nervous system poorly, so its contribution to the effects of an oral decoction is likely peripheral rather than central.
Arecoline
Pyridine alkaloid (methyl ester)Concentration: 0.00-0.070% of the dried pericarp, and undetectable in most pericarp batches, against 0.194-0.346% in the seed (Tian et al., 2018)
A non-selective muscarinic receptor agonist and the compound responsible for the prokinetic action attributed to this drug: pericarp extract contracts porcine lower oesophageal sphincter muscle through muscarinic receptors. It is also the principal toxic and genotoxic constituent of the areca seed. Its presence in a pericarp batch is evidence of seed material in the drug rather than a normal feature of the pericarp.
Guvacoline
Pyridine alkaloid (methyl ester)Concentration: 0.00-0.020% of the dried pericarp, versus 0.065-0.094% in the seed (Tian et al., 2018)
The N-demethylated analogue of arecoline. Like arecoline it is frequently below the limit of detection in pericarp samples, which is why it is not used as a marker for this drug.
Condensed tannins (proanthocyanidins)
PolyphenolConcentration: present in the fruit wall; the frequently quoted figure of about 15% refers to the areca seed, not to the pericarp, and no equivalent validated figure for the pericarp has been published
Astringent polyphenols that bind alkaloids and proteins. Their main practical consequence is that a tannin-rich decoction can complex co-administered alkaloidal or protein drugs and mineral supplements in the gut lumen.
⚠ Drug Interactions
Areca nut (Semen Arecae, Bing Lang) present as a contaminant or substitute in the pericarp drug
Da Fu Pi is the pericarp and Bing Lang is the seed of the same palm, so seed fragments are the natural adulterant of this drug and the two are easily confused in dispensing. Direct analytical evidence of this exists: although most pericarp batches contain no detectable arecoline at all, some contained up to 0.070%, approaching the seed's own 0.194-0.346% range (Tian et al., 2018). Areca nut is classified by IARC in Group 1, carcinogenic to humans, for cancer of the oral cavity and oesophagus, and arecoline is the constituent implicated in oral submucous fibrosis and oral squamous cell carcinoma. The pericarp itself has never been evaluated separately by IARC and carries only traces of arecoline.
Clinical note: Buy Da Fu Pi from a supplier who can show alkaloid assay data, and reject material containing hard seed fragments. Do not extrapolate the seed's carcinogenicity monograph to the pericarp, and equally do not assume a pericarp batch is alkaloid-free.
Antimuscarinic drugs (atropine, hyoscine, oxybutynin, tricyclic antidepressants, first-generation antihistamines)
Arecae pericarpium extract contracts porcine lower oesophageal sphincter sling and clasp muscle in a concentration-dependent way, and the contraction is mediated by muscarinic receptors (Tey et al., 2021). Any competitive muscarinic antagonist will blunt that action pharmacodynamically. The size of the effect is batch-dependent because the arecoline content of the pericarp ranges from undetectable to 0.070%.
Clinical note: If a patient on an antimuscarinic gets no benefit from a Da Fu Pi formula for distension, this rather than the dose is the likely explanation. In a patient taking an antimuscarinic for detrusor overactivity or gastro-oesophageal reflux, watch for the reverse: return of symptoms.
Cholinergic drugs (donepezil, rivastigmine, pyridostigmine, bethanechol, pilocarpine)
The alkaloid fraction of the areca fruit acts on muscarinic receptors, which is the documented mechanism of the pericarp's effect on smooth muscle. Adding a direct muscarinic agonist or a cholinesterase inhibitor gives additive parasympathetic stimulation. Reports of bronchoconstriction and heart-rate change with areca preparations concern the alkaloid-rich seed, so the risk from pericarp is proportionately smaller but is not zero in batches that do contain arecoline.
Clinical note: Use cautiously in asthma and in patients on cholinesterase inhibitors or beta-blockers; stop the herb if cramping, sweating, wheeze or symptomatic bradycardia appear.
Alkaloidal and protein drugs taken in the same dose window (e.g. oral iron, levothyroxine, aminoglycosides, alkaloid tablets)
The areca fruit wall is rich in condensed tannins, which precipitate alkaloids, proteins and metal ions in the gastrointestinal lumen. This is a general property of tannin-rich decoctions rather than a documented clinical interaction of this particular drug.
Clinical note: Separate the decoction from narrow-therapeutic-index oral drugs and mineral supplements by two hours.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| decoction | 5–10 g | Daily | — | — | 中国药典 2020 【用法与用量】5～10g。 【性味与归经】辛，微温。归脾、胃、大肠、小肠经。 — Chinese Pharmacopoeia 2020, quoted verbatim; route and cautions preserved. Replaces a cleared category-filler value. |
Evidence Tier
Moderate evidence · 3 studiesRecorded studies by study design, strongest design at the top. This is a study-design tier only, not a GRADE rating: it does not weigh risk of bias, consistency or precision.
Systematic review / meta-analysis
0
Randomized controlled trial
0
Other clinical trial
0
Observational / case report
0
In vitro / animal
3
1 verified · 2 unverified
Show 3 studies
- Arecae pericarpium extract induces porcine lower-esophageal-sphincter contraction via muscarinic receptors
- [Comparative study on contents of four alkaloids in homologous herbal medicines--Arecae Pericarpium and Arecae Semen].
- Determination of contents of four alkaloids in Pericarpium arecae by quantitative analysis of multi-components by single-marker
Other / unclassified
0
Verified: design read from PubMed for a DOI that resolves to the cited paper Unverified: taken from the study's recorded description
Clinical Studies
Arecae pericarpium extract induces porcine lower-esophageal-sphincter contraction via muscarinic receptors
Working on isolated porcine lower oesophageal sphincter sling and clasp muscle strips, the authors showed that Arecae pericarpium extract and arecoline produce concentration-dependent contraction, and that the response is mediated by muscarinic receptors. This is the best mechanistic evidence for the traditional claim that Da Fu Pi moves qi downward and relieves distension, and it is specific to the pericarp rather than the seed.
[Comparative study on contents of four alkaloids in homologous herbal medicines--Arecae Pericarpium and Arecae Semen].
HPLC assay of 10 batches of Arecae Pericarpium against 7 batches of Arecae Semen. All four alkaloids were substantially lower in the pericarp (arecaidine 0.010-0.032%, guvacine 0.006-0.029%, arecoline 0.00-0.070%, guvacoline 0.00-0.020%) than in the seed (arecaidine 0.020-0.045%, guvacine 0.031-0.086%, arecoline 0.194-0.346%, guvacoline 0.065-0.094%), and most pericarp batches contained no arecoline or arecaidine at all. The authors conclude that only arecaidine and guvacine are usable quality markers for the pericarp. Published in Chinese.
Determination of contents of four alkaloids in Pericarpium arecae by quantitative analysis of multi-components by single-marker
Validated a single-marker quantitative method, using arecoline as internal standard, for arecaidine, guvacine and guvacoline in 12 samples of Pericarpium Arecae, and found it more accurate than the external standard method. Method-development work that underpins alkaloid quality control for this drug specifically.
⚠ Safety & Contraindications
Contraindications
Its use is cautious in patients with qi deficiency or the weak body constitution.
Source: Xi S, Gong Y. Essentials of Chinese Materia Medica and Medical Formulas. Academic Press/Elsevier, 2017, pp. 171–182.
Historical Texts
Ben Cao Gang Mu
Ming dynastyReferences
- Sun Y, Feng J, Hou W, Qi H, Liu Y. Comprehensive insights into areca nut: active components and omics technologies for bioactivity evaluation and quality control . Frontiers in Pharmacology (2024) [DOI]
- International Agency for Research on Cancer. Betel-quid and areca-nut chewing and some areca-nut-derived nitrosamines . IARC Monographs on the Evaluation of Carcinogenic Risks to Humans, Volume 85 (2004)
- Chinese Pharmacopoeia Commission. Arecae Pericarpium (Da Fu Pi) . Pharmacopoeia of the People's Republic of China (2020)
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.
📝 Notes
Public notes from the community and your own private notes on Da Fu Pi.
No notes yet.