Ephedra
EphedraceaeEphedra sinica
Also known as: Ma Huang, Chinese Ephedra, Desert Tea
clinical_notes Clinical Summary
Ephedra (Ma Huang, Ephedra sinica) is a potent sympathomimetic herb containing ephedrine alkaloids, classically used in TCM for wind-cold exterior syndromes with wheezing.
The FDA banned ephedrine-alkaloid dietary supplements in 2004 due to documented cardiovascular and CNS adverse events including hypertension, stroke, myocardial infarction, and sudden cardiac death.
In the US it remains restricted to prescription drug products; in TCM practice, it is used short-term under the supervision of a trained practitioner with careful cardiovascular screening.
Pregnancy Safety
Contraindicated in pregnancy. Ephedrine crosses the placenta, can cause fetal tachycardia, and is associated with intrauterine growth restriction. Banned for use as a dietary supplement in the US.
Lactation Safety
Ephedrine and pseudoephedrine pass into breast milk; may cause infant irritability, poor feeding, and tachycardia. Pseudoephedrine reduces milk supply.
warning Contraindications
- Hypertension (contraindicated)Clinically Proven
- Coronary artery disease / ischemic heart disease (contraindicated)Clinically Proven
- Arrhythmia (contraindicated)Clinically Proven
- Stroke / cerebrovascular disease (contraindicated)Clinically Proven
- Concurrent MAO inhibitor therapy (contraindicated)Clinically Proven
- Pregnancy (contraindicated)Clinically Proven
- Hyperthyroidism (contraindicated)Theoretical
- Narrow-angle glaucoma (contraindicated)Theoretical
- Benign prostatic hypertrophy (avoid)Theoretical
vital_signs Clinical Profile
Primary Indications
- check_circle Acute bronchospasm (historical)
- check_circle Asthma with cold signs (TCM)
- check_circle Nasal congestion
- check_circle Wind-Cold exterior syndrome (TCM)
- check_circle Edema with exterior syndrome (TCM)
Therapeutic Actions
System Affinities
- check_circle Respiratory
- check_circle Cardiovascular
- check_circle Nervous system (CNS)
labs Active Constituents
L-ephedrine
D-pseudoephedrine
Norephedrine
Methylephedrine
Norpseudoephedrine
Ephedroxane
Tannins
Flavonoids
history_edu Traditional Use
Traditional Chinese Medicine (TCM)
麻黃 (Ma Huang)
Nature: warm
- Releases the Exterior (Wind-Cold)
- Disperses Cold
- Promotes sweating
- Disseminates Lung Qi to calm wheezing
- Promotes urination (reduces edema)
- Warms and transforms thin mucus
One of the most important pungent warm exterior-releasing herbs in the Shang Han Lun (Treatise on Cold Damage, Zhang Zhongjing, ~200 CE). Used only by trained TCM practitioners due to its potency. Honey-preparation (Zhi Ma Huang) moderates warming nature and is preferred for chronic wheezing.
Traditional Uses Across Healing Systems
While many herbs lack controlled clinical trials, centuries of traditional practice across cultures provide valuable insight into their therapeutic applications.
Diaphoretic for Wind-Cold common cold; bronchodilator for asthma with Cold phlegm; diuretic for acute edema with exterior signs
Classic formula Ma Huang Tang remains one of the most prescribed herbal decoctions for acute respiratory illness in East Asia.
Maoto (Ma Huang Tang) is an officially approved prescription drug in Japan for influenza
Used by Japanese physicians for early-stage influenza; clinical trials show efficacy comparable to oseltamivir for symptom duration.
Ephedra nevadensis and E. viridis ('Mormon tea') used as stimulant beverage and for kidney ailments; these species contain minimal or no ephedrine alkaloids
American Ephedra species differ substantially from Asian Ma Huang in alkaloid content.
Somalata; used in classical preparations for respiratory and cardiac conditions
Identification with the mythological 'Soma' plant is debated.
spa Parts Used
stem
- Bronchospasm (TCM wheezing)
- Wind-Cold common cold
- Nasal congestion
Aerial green stems (herba ephedrae) contain the alkaloids; the woody root (Ma Huang Gen) has opposite action—it tonifies and stops sweating rather than inducing it, and contains different constituents (ephedradines).
root
- Spontaneous sweating (TCM)
- Night sweats (TCM Yin deficiency)
Ma Huang Gen has the OPPOSITE action of the stem—it astringes and stops sweating. Very important clinical distinction; the root must not be substituted for the stem.
shield Safety
Contraindications — Evidence Basis
Hypertension
Ephedrine causes dose-dependent elevations in blood pressure; hypertension is the single most common ephedra-associated adverse event.
Coronary artery disease / ischemic heart disease
Ephedrine-induced coronary vasoconstriction and increased myocardial oxygen demand have been linked to myocardial infarction and sudden cardiac death.
Arrhythmia
Ephedrine shortens cardiac refractory periods, causing re-entrant arrhythmias including atrial tachycardia, ventricular tachycardia, and sudden death.
Stroke / cerebrovascular disease
Ephedra has been linked to hemorrhagic and ischemic stroke through vasoconstriction and hypertension.
Concurrent MAO inhibitor therapy
Co-administration with MAO inhibitors precipitates hypertensive crisis through potentiated catecholamine release.
Pregnancy
Ephedrine crosses the placenta and may cause fetal tachycardia; associated with increased risk of preterm labor.
Hyperthyroidism
Additive sympathetic stimulation may precipitate thyroid storm.
Narrow-angle glaucoma
Sympathomimetic mydriasis may precipitate acute angle closure.
Benign prostatic hypertrophy
α-adrenergic stimulation of prostatic urethra worsens urinary retention.
Monitoring Parameters
Monitor during use, especially with prolonged or high-dose therapy.
Blood pressure and heart rate
Before each dose and daily during useEphedrine causes dose-dependent BP and HR elevation; hypertension was the most common adverse event in FDA review of 140 cases.
flagThreshold: SBP >140 mmHg or resting HR >100 bpm: discontinue.
ECG (in patients with cardiovascular risk)
Baseline before treatmentIdentify pre-existing arrhythmia or ischemia that would contraindicate use.
flagThreshold: Any ischemic change or arrhythmia: do not prescribe.
Toxicity
Ephedrine doses >100 mg/day or cumulative doses >300 mg/day associated with serious cardiovascular adverse events; therapeutic ephedrine dose is 12.5-25 mg up to 4x/day (maximum 150 mg/day); ephedra herb 15-30 mg of total alkaloids per day is the upper safety limit.
Hypertension, tachycardia, palpitations, arrhythmia, myocardial infarction, stroke, seizure, psychosis, agitation, insomnia, mydriasis, urinary retention; deaths reported.
Discontinuation; IV benzodiazepines for agitation/seizure; short-acting β-blockers (esmolol) or α-blockers (phentolamine) for severe hypertension (avoid non-selective β-blockade alone due to unopposed α-activity). Cardiac monitoring. Activated charcoal if within 1 hour of oral ingestion.
Adverse Effects
CYP Metabolism
Ephedrine is primarily excreted unchanged in urine; minor metabolism via CYP2D6 to norephedrine. Urinary alkalinization dramatically reduces renal clearance and prolongs half-life.
swap_horiz Interactions
Monoamine Oxidase Inhibitors (MAOIs) - phenelzine, tranylcypromine, selegiline
Class: Antidepressant (MAOI)
Ephedrine is an indirect sympathomimetic that displaces norepinephrine from presynaptic vesicles. When MAO is inhibited, synaptic norepinephrine is not broken down, resulting in excessive adrenergic stimulation and potential hypertensive crisis, intracerebral hemorrhage, or malignant hyperthermia.
Absolute contraindication. Do not use ephedra within 14 days of MAOI therapy. Counsel patients about life-threatening hypertensive crisis risk. Use alternative cold/decongestant herbs such as Yerba Santa or Mullein.
Caffeine
Class: CNS stimulant / methylxanthine
Caffeine and ephedrine have additive sympathomimetic effects — caffeine augments catecholamine release and inhibits phosphodiesterase, amplifying ephedrine-induced increases in heart rate and blood pressure. FDA MedWatch analysis found this combination associated with 47% cardiovascular and 18% CNS adverse events, including stroke, MI, and sudden death.
Avoid combining ephedra with caffeine-containing products (coffee, yerba mate, guarana, cola nut, caffeinated energy drinks). If use is unavoidable, restrict total caffeine to <200 mg/day and monitor blood pressure and pulse. Discontinue immediately if palpitations, chest pain, or headache occur.
Warfarin
Class: Anticoagulant (vitamin K antagonist)
Sympathomimetic-induced hypertension and vasoconstriction may increase bleeding risk on warfarin, particularly intracerebral hemorrhage, given ephedra's documented association with hemorrhagic stroke. Ephedra does not directly alter CYP2C9 metabolism of warfarin.
Avoid ephedra in patients on warfarin due to stroke/hemorrhage risk from ephedra-induced hypertension. Monitor blood pressure closely and consider alternative decongestants.
Antihypertensive agents (beta-blockers, ACE inhibitors, ARBs, calcium channel blockers)
Class: Antihypertensive
Ephedrine's alpha-1 agonism causes vasoconstriction and beta-1 agonism increases cardiac output, raising blood pressure and heart rate. This directly opposes antihypertensive mechanisms. Hypertension was the single most frequent adverse event reported in FDA database (17 of 140 cases).
Avoid use in patients on antihypertensive therapy. If use occurs, monitor blood pressure daily and discontinue if systolic rises >10-15 mmHg. Avoid entirely in uncontrolled hypertension.
Cardiac glycosides (digoxin)
Class: Cardiotonic / antiarrhythmic
Ephedrine's sympathomimetic effects (increased heart rate, positive inotropy, shortened refractory period) combined with digoxin's narrow therapeutic window significantly increases risk of ventricular arrhythmias, including ventricular tachycardia and fibrillation.
Avoid coadministration. If necessary, monitor ECG continuously for arrhythmias and obtain digoxin levels. Discontinue ephedra at first sign of palpitations or ectopy.
Theophylline
Class: Methylxanthine bronchodilator
Theophylline and ephedrine both exert sympathomimetic effects on the heart and CNS. Combination causes additive tachycardia, tremor, insomnia, hypertension, and increases seizure threshold lowering. Neither undergoes significant pharmacokinetic interaction, but pharmacodynamic additivity is substantial.
Avoid coadministration. If patient requires bronchodilator therapy, substitute an inhaled beta-2 agonist. Monitor for tachycardia, tremor, and agitation.
General anesthetics (halothane, isoflurane, sevoflurane)
Class: Volatile anesthetic
Halogenated volatile anesthetics sensitize the myocardium to catecholamines. Ephedrine's indirect sympathomimetic action can precipitate ventricular arrhythmias and myocardial ischemia during anesthesia.
Discontinue ephedra at least 24 hours (preferably 1 week) before elective surgery. Alert anesthesia team about use; they may use alternative vasopressors (phenylephrine, norepinephrine) for intraoperative hypotension.
Dexamethasone / corticosteroids
Class: Glucocorticoid
Both agents induce hypokalemia; ephedra via beta-2 mediated intracellular potassium shift and corticosteroids via mineralocorticoid effect. Combined hypokalemia increases risk of arrhythmias and muscle weakness. Corticosteroids also potentiate ephedrine's cardiovascular effects.
Monitor serum potassium and ECG. Supplement potassium if needed. Avoid in patients on high-dose systemic corticosteroids.
Insulin / sulfonylureas / oral antidiabetic agents
Class: Antidiabetic
Ephedrine stimulates hepatic glycogenolysis and gluconeogenesis via beta-2 adrenergic receptors and reduces insulin sensitivity, producing hyperglycemia and opposing glucose-lowering therapy.
Monitor blood glucose more frequently if use is unavoidable; anticipate possible upward dose adjustment of antidiabetic agents. Avoid in type 1 diabetes due to risk of DKA precipitation.
hub Combinations
Synergistic pairings can enhance therapeutic outcomes, while knowing suitable substitutes helps when specific herbs are unavailable or contraindicated.
Classical Formulas
2Cinnamon
Traditional UseClassical pairing in Ma Huang Tang (with Gui Zhi / cinnamon twig) to strongly release Wind-Cold exterior through diaphoresis.
Classical TCM formula used for >1800 years; modern clinical studies in Kampo show efficacy for influenza.
Licorice Root
Traditional UseIn Ma Huang Tang, Gan Cao (licorice) moderates the potent drying/warming nature of Ma Huang and harmonizes the formula.
Classical formula with >1800-year documented use.
Possible Substitutes
2Elecampane
Traditional UseWestern herbal expectorant and bronchodilator alternative without cardiovascular risk.
Traditional use; limited modern clinical data.
Wild Cherry Bark
Traditional UseMuch safer substitute for bronchospastic cough in Western herbal practice; antitussive without sympathomimetic effects.
Traditional Western use; no direct comparative trials.
Synergistic Combinations
1Lobelia
Traditional UseEclectic physicians combined ephedra (or its substitutes) with lobelia for acute asthma via complementary autonomic effects; both potent herbs requiring expert use.
Historical eclectic medical literature; no modern trials.
science Studies
Efficacy and safety of ephedra-containing oral medications: a systematic review, meta-analysis, and exploratory dose-response analysis for weight reduction
Meta-AnalysisThis systematic review and meta-analysis synthesized 16 randomized controlled trials of ephedra-containing oral medications (EOMs) in overweight and obese adults with a BMI ≥25. The primary meta-analysis demonstrated statistically significant additional reductions in BMI (MD: -1.5 kg/m², 95% CI: -2.46 to -0.54), body weight, and waist circumference in the ephedra treatment groups compared to controls. A dose-response analysis indicated that both higher daily ephedrine doses and longer treatment durations explained heterogeneity in BMI and body weight outcomes, supporting a dose-dependent relationship. Safety meta-analysis found no statistically significant difference in adverse events or dropout rates between treatment and control groups. The authors conclude that ephedra-containing medications are effective for weight reduction when supervised by clinicians within established dosing guidelines, though further high-quality RCTs are needed.
A comprehensive study of Ephedra sinica Stapf-Schisandra chinensis (Turcz.) Baill herb pair on airway protection in asthma
In VivoThis study employed network pharmacology combined with in vivo animal experiments to investigate the synergistic mechanisms of the Ephedra sinica-Schisandra chinensis (Mahuang-Wuweizi) herb pair against asthma progression. Network pharmacology analysis identified 22 active components in Ephedra, 8 in Schisandra, and 115 overlapping targets linked to asthma, including key signaling molecules in the PI3K/AKT and NF-κB pathways. In OVA-sensitized bronchial asthma rats, the herb pair significantly reduced airway remodeling markers (collagen fiber accumulation, airway smooth muscle proliferation), decreased serum and tissue levels of IL-6, TNF-α, and IL-1β, and suppressed the PLC/TRPC1/PI3K/AKT/NF-κB signaling pathway. The results confirm that the combination of Ephedra sinica and Schisandra chinensis exerts synergistic anti-asthmatic effects greater than either herb alone, validating the traditional use of this herb pair in managing cough and asthma.
medication Dosing
decoction
2-9 g dried stem (containing ~30-180 mg total ephedrine alkaloids)
Once daily, short-term (1-3 days) only
Classical TCM dose; should be prescribed only by trained herbalist. Honey-processed Ma Huang preferred for chronic use. Total alkaloids should not exceed 150 mg/day.
capsule
BANNED in US dietary supplements since 2004
N/A
FDA banned ephedrine-alkaloid-containing dietary supplements in 2004; similar bans in EU (2015). Pharmaceutical ephedrine HCl (12.5-25 mg PO up to 4x/day, max 150 mg/day) remains available by prescription.
Disclaimer: This information is largely AI-generated and reviewed by human experts at Evara Health. It is intended for educational and clinical reference purposes only and should not replace professional medical advice.
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