☯ TCM Properties
Regulates Qi, invigorates the Blood (disperses abdominal distention due to constipation) and purges meat due to overeating; Clears Heat; Kills parasites; Resolves and expels Cold Phlegm; Regulates the uterus
Traditional Chinese Uses
A Wei is asafoetida, the fetid oleo-gum-resin exuded from the rootstock of Ferula sinkiangensis and related Ferula species (Apiaceae). Pungent, bitter and warm, entering the Spleen and Stomach (also Liver and Kidney) channels, it is classed among the food-stagnation-relieving herbs. It powerfully dissolves accumulations and disperses hard masses, and is used for food stagnation (especially from overeating meat), abdominal distension, fullness and pain, and abdominal masses (zheng jia). It also kills parasites and treats parasitic abdominal pain, and resolves and expels Cold-Phlegm.
Owing to its strong odor it is usually taken in pills or powders rather than decoction, often with Qi-regulating and stagnation-dispersing herbs.
Western Herbalism Properties
Botanical Description
A Wei is the dried oleo-gum-resin (asafoetida) exuded from the living rootstock and lower stems of giant perennial herbs in the genus Ferula (Apiaceae), principally Ferula sinkiangensis K.M.Shen in Chinese commerce and Ferula assa-foetida L. in the broader Asian and European trade. These plants are robust, monocarpic to polycarpic herbaceous perennials 1-3 m tall with a thick, fleshy, sulphurous-smelling taproot, a stout hollow flowering stem, finely divided pinnatisect basal leaves, and large compound umbels of small yellow flowers, native to the steppes and mountains of Iran, Afghanistan, Central Asia, and western China. To collect the resin, mature roots are exposed and incised; the milky exudate hardens into reddish-brown to yellowish-brown irregular masses or tears with an intensely pungent, alliaceous, persistent odour.
Active Constituents
Ferulic acid and esters
Phenylpropanoid (phenolic acid)Concentration: Major phenolic component of the resin
The namesake acid of the resin, with antioxidant, anti-inflammatory, hepatoprotective, vasodilator and antithrombotic activity; contributes to the herb's blood-moving and qi-regulating reputation.
Sesquiterpene coumarins (farnesiferol A/B/C, galbanic acid, asafoetidin)
Sesquiterpene coumarinConcentration: Dominant characteristic class (>30 coumarins reported)
The signature constituents of asafoetida resin, showing antiviral (some more potent than amantadine against influenza A), antispasmodic, antiplatelet, cytotoxic/anticancer and relaxant activity relevant to its use for abdominal distention and masses.
Umbelliferone
Simple coumarinConcentration: Minor
A hydroxycoumarin with antioxidant, anti-inflammatory and antimicrobial activity.
Organosulfur volatiles (2-butyl propenyl disulfide and related disulfides)
Sulfur-containing volatile (essential oil)Concentration: ~5-20% essential oil, sulfur-rich
Responsible for the intense fetid garlic-like odor. These disulfides carry the carminative, antispasmodic, antimicrobial and antiparasitic actions that underlie the herb's use for food stagnation and parasites.
Luteolin
Flavonoid (flavone)Concentration: Minor
A flavone with antioxidant and anti-inflammatory activity present in the oleo-gum-resin.
Galbaresinic / asaresinotannol resins
Resin acids/alcoholsConcentration: ~40-65% resin fraction
The bulk resin matrix (gum ~25%, resin ~40-65%, oil ~10-20%) that carries the coumarin actives and gives the drug its adhesive, warming, phlegm-dispersing character.
⚠ Drug Interactions
Anticoagulant / antiplatelet drugs (warfarin, clopidogrel, aspirin)
Coumarins and ferulic acid in asafoetida have documented antiplatelet and antithrombotic activity, which may add to the effect of anticoagulant and antiplatelet medicines.
Clinical note: Monitor for bruising or bleeding and check INR if combined with warfarin.
Antihypertensive drugs
Asafoetida shows vasodilatory and blood-pressure-lowering effects in preclinical work, which could add to antihypertensive therapy.
Clinical note: Monitor blood pressure when used with antihypertensive agents.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| decoction | 6-12g | Daily | — | — | — |
Preparation Methods
Pill or powder (encapsulated)
Parts: oleo-gum-resin
Because of its extremely foul odor and to protect the active volatiles, A Wei is not usually decocted; 0.9-1.5 g of the resin is taken as pills or powder, often in gelatin capsules, to disperse food stagnation and abdominal masses.
Medicinal paste / plaster (external)
Parts: oleo-gum-resin
The resin is softened and incorporated into external plasters applied over abdominal masses (concretions and gatherings) to soften and disperse them.
Clinical Studies
Safety and Efficacy of Ferula asafoetida in Functional Dyspepsia: A Randomized, Double-Blinded, Placebo-Controlled Study
In 43 adults with moderate-to-severe functional dyspepsia, a standardized asafoetida preparation (250 mg twice daily for 30 days) produced significant improvement in global dyspepsia score and quality of life versus placebo, supporting its classic use for food stagnation and abdominal distention.
Historical Texts
Xin Xiu Ben Cao / Tang Ben Cao (Newly Revised Materia Medica)
Tang dynasty, 659 CEBen Cao Gang Mu (Compendium of Materia Medica)
Ming dynasty, 1578, Li ShizhenReferences
- Iranshahy M, Iranshahi M. Traditional uses, phytochemistry and pharmacology of asafoetida (Ferula assa-foetida oleo-gum-resin) - A review . Journal of Ethnopharmacology (2011) [DOI]
- Mala KN, Thomas J, Syam DS, Maliakel B, Krishnakumar IM. Safety and Efficacy of Ferula asafoetida in Functional Dyspepsia: A Randomized, Double-Blinded, Placebo-Controlled Study . Evidence-Based Complementary and Alternative Medicine (2018) [DOI]
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.
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