☯ TCM Properties
Induces Sweating and Releases the Exterior; Disperses Wind-Cold; Descends Lung Qi and Calms Wheezing; Promotes Urination and Reduces Edema; Disperses Cold and unblocks painful obstruction
Traditional Chinese Uses
Ma Huang (ephedra stem) is a powerful, pungent, warm herb used to open the pores and cause sweating in Wind-Cold external invasions, to calm wheezing and coughing by dispersing obstructed Lung Qi, and to reduce edema. It is one of the fastest-acting herbs in the Chinese materia medica and is contraindicated in those with Wei Qi deficiency, spontaneous sweating, or cardiovascular conditions. Its active alkaloids form the pharmacological basis for ephedrine.
Western Herbalism Properties
Used In Formulas (1)
Botanical Description
Ephedra sinica is a low, much-branched gymnosperm shrub in the Ephedraceae, native to northern China, Mongolia and adjacent parts of Russia, where it inhabits dry steppes, sandy slopes and gravelly desert margins. Plants typically grow 20-40 cm tall, forming dense clumps of slender, jointed, bright green photosynthetic stems that resemble those of horsetails. The leaves are reduced to small, scale-like sheaths at the nodes, leaving the photosynthesis to the green stems. The species is dioecious: male cones are small and yellow, while female cones, borne on separate plants, ripen into fleshy, berry-like red structures about 6-8 mm long, each enclosing one or two seeds. The plant has a deep, woody taproot adapted to arid conditions. It is the principal commercial source of the alkaloid ephedrine and has been harvested for centuries from wild populations in Inner Mongolia and surrounding regions.
Active Constituents
L-Ephedrine
Phenethylamine (amphetamine-type) alkaloidConcentration: 40-90% of total alkaloids; ~0.5-2.5% of dried herb
The principal bioactive alkaloid. A mixed-acting sympathomimetic that both releases endogenous noradrenaline and directly stimulates alpha- and beta-adrenergic receptors, producing bronchodilation, increased cardiac output, elevated blood pressure, CNS stimulation and thermogenesis. Accounts for the classic anti-asthmatic (wheeze-calming) action of Ma Huang.
D-Pseudoephedrine
Phenethylamine alkaloid (diastereomer of ephedrine)Concentration: ~20-45% of the alkaloid fraction
A nasal and systemic decongestant with weaker CNS and cardiac effects than ephedrine but stronger diuretic activity. Contributes to Ma Huang's traditional action of promoting urination and reducing edema.
L-Methylephedrine
N-methylated phenethylamine alkaloidConcentration: Minor alkaloid, typically <10% of alkaloid fraction
Possesses bronchodilating and antitussive activity; used pharmaceutically as a cough suppressant. Supports the descending-Lung-Qi, wheeze-calming function.
L-Norephedrine (phenylpropanolamine)
Phenethylamine alkaloid (nor-derivative)Concentration: Minor alkaloid
A sympathomimetic amine contributing to vasoconstrictor and appetite-suppressant activity of the alkaloid pool.
Ephedrannins (ephedra tannins / proanthocyanidins)
Condensed tannins / polyphenolsConcentration: Present in variable amounts
Macromolecular condensed tannins (e.g., ephedrannin A/B) with anti-inflammatory, antioxidant and blood-pressure-lowering effects that partly counterbalance the pressor alkaloids.
Ephedroxane and herbacetin-type flavonoids
Flavonoids / oxazolidinoneConcentration: Trace to minor
Contribute anti-inflammatory and anti-allergic activity; ephedroxane shows anti-inflammatory effects distinct from the alkaloids.
Volatile oil (l-alpha-terpineol, terpinen-4-ol, 2,3,5,6-tetramethylpyrazine)
Terpenoid essential oil / pyrazineConcentration: ~0.25% of dried herb
The aromatic fraction contributes diaphoretic and antiviral activity; terpinen-4-ol and related terpenes support the surface-releasing (exterior-venting) function.
Ephedra polysaccharides
PolysaccharidesConcentration: Variable
Show immunomodulatory and anti-inflammatory activity in preclinical models, contributing to non-alkaloid pharmacology of the herb.
⚠ Drug Interactions
Monoamine oxidase inhibitors (phenelzine, tranylcypromine, selegiline)
MAO inhibition blocks metabolism of catecholamines released by ephedrine; the resulting accumulation of noradrenaline can trigger severe hypertension, hyperthermia and cardiac arrhythmia.
Clinical note: Contraindicated together; avoid ephedra within 2 weeks of MAOI therapy.
Caffeine and other CNS stimulants
Additive sympathomimetic and CNS-stimulant effects markedly increase heart rate, blood pressure and the risk of arrhythmia, seizure and stroke. Ephedra-caffeine combinations drove most reported serious adverse events.
Clinical note: Avoid combining ephedra with caffeine-containing products; this pairing was central to the U.S. ban of ephedra dietary supplements.
Cardiac glycosides (digoxin)
Sympathomimetic stimulation from ephedrine may sensitize the myocardium and, combined with digoxin's effects on cardiac excitability, increase the likelihood of ectopic beats and arrhythmias.
Clinical note: Use caution and monitor for palpitations in patients on digoxin.
Antihypertensive agents (beta-blockers, guanethidine, methyldopa)
Ephedrine's pressor action antagonizes antihypertensive drugs and may reduce their efficacy; with non-selective beta-blockade, unopposed alpha-adrenergic vasoconstriction can raise blood pressure.
Clinical note: Monitor blood pressure; avoid in poorly controlled hypertension.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| decoction | 3-9g | Daily | — | — | — |
Preparation Methods
Raw Ma Huang (sheng ma huang) decoction
Parts: dried herbaceous stem
Typical dose 1.5-9 g decocted in water. Traditionally the stems are cut and the foam that rises during boiling is skimmed off (said to reduce the herb's tendency to cause irritability/restlessness). The raw form has the strongest diaphoretic (sweat-inducing, exterior-releasing) action and is preferred for wind-cold exterior patterns and acute wheezing.
Honey-fried Ma Huang (zhi ma huang / mi zhi ma huang)
Parts: dried stem stir-fried with honey
The stems are stir-fried with honey until no longer sticky. Honey-processing moderates the harsh diaphoretic effect and enhances the moistening, Lung-Qi-descending and wheeze-calming action, making it the preferred form for cough and wheezing where strong sweating is undesirable.
Ma Huang rong (defatted / powdered form)
Parts: dried stem, crushed to fibrous 'velvet'
The stem is pounded into a soft fibrous mass; this gentler form is used for weak or elderly patients requiring a milder surface-releasing action.
Clinical Studies
Efficacy and Safety of Ephedra and Ephedrine for Weight Loss and Athletic Performance: A Meta-analysis
Pooling 52 controlled trials, ephedrine/ephedra (often with caffeine) produced modest short-term weight loss of roughly 0.9 kg per month over placebo but was associated with a 2-3-fold increase in psychiatric, autonomic, gastrointestinal and palpitation-related adverse events. The safety findings contributed to the 2004 U.S. FDA ban on ephedra-containing supplements.
Herbal ephedra/caffeine for weight loss: a 6-month randomized safety and efficacy trial
In 167 overweight adults, a standardized ephedra (90 mg ephedrine alkaloids)/caffeine herbal combination produced greater weight and fat loss and improved lipids over 6 months versus placebo. Blood pressure and heart rate rose modestly and more participants reported dry mouth, insomnia and palpitations.
Historical Texts
Shennong Bencao Jing (Divine Farmer's Materia Medica)
Eastern Han dynasty, c. 200 CEShang Han Lun (Treatise on Cold Damage), by Zhang Zhongjing
Eastern Han dynasty, c. 200 CEBen Cao Gang Mu (Compendium of Materia Medica), by Li Shizhen
Ming dynasty, 1596 CEReferences
- Zheng Q, Mu X, Pan S, Luan R, Zhao P. Ephedrae herba: A comprehensive review of its traditional uses, phytochemistry, pharmacology, and toxicology . Journal of Ethnopharmacology (2023) [DOI]
- Zhang Y, et al.. Ephedrae Herba: A Review of Its Phytochemistry, Pharmacology, Clinical Application, and Alkaloid Toxicity . Molecules (2023) [DOI]
- Shekelle PG, Hardy ML, Morton SC, et al.. Efficacy and Safety of Ephedra and Ephedrine for Weight Loss and Athletic Performance: A Meta-analysis . JAMA (2003) [DOI]
- Bensky D, Clavey S, Stoger E. Chinese Herbal Medicine: Materia Medica, 3rd Edition . Eastland Press (2004) [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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