Ma Huang

Botanical

What is it

Ma huang is the Chinese name for Ephedra sinica, a desert shrub whose dried stems are used in traditional Chinese medicine for cold symptoms, asthma, and as a diaphoretic. The plant contains the stimulant alkaloid ephedrine. In the U.S., the FDA banned the sale of dietary supplements containing ephedrine alkaloids in 2004 following reports of serious cardiovascular events and deaths.

Evidence for 3 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Bronchodilation / asthma (traditional/medical)

Strong Evidence

Ephedrine is an effective bronchodilator, though now largely superseded by beta-2 selective agonists with better safety profiles.

Decongestion

Strong Evidence

Pseudoephedrine (a closely related compound) is an effective decongestant.

Weight loss

Good Evidence

Effective at causing modest weight loss but with unacceptable cardiovascular risk. Banned for this purpose in U.S. supplements.

How it works

Ephedrine and pseudoephedrine in ma huang are sympathomimetic amines that stimulate alpha- and beta-adrenergic receptors. They cause vasoconstriction, bronchodilation, increased heart rate, and increased metabolic rate. These effects underlie their traditional and modern use as decongestants, bronchodilators, and weight-loss stimulants, but also their cardiovascular risk profile.

Dosage

Ma huang is banned in dietary supplements in the U.S. since 2004. Pharmaceutical ephedrine for medical use is prescribed by clinicians and is regulated separately. Traditional Chinese decoctions of ma huang are still used by licensed TCM practitioners.

When and how to take it

If used by a clinician, follow specific prescriber instructions. Avoid evening doses due to stimulant effects on sleep.

2 commercial forms

Compare the main delivery options and what they’re best suited for.

Ma huang (Ephedra) crude herb

Banned as a U.S. dietary supplement; available only through TCM practitioners.

Variable alkaloid content.

Pharmaceutical ephedrine

Used in clinical settings under medical supervision.

Standardized prescription drug.

Safety

Serious side effects: hypertension, tachycardia, arrhythmias, stroke, myocardial infarction, seizures, psychiatric effects, and death. Risk is increased with caffeine or other stimulants, in people with cardiovascular disease, and at higher doses.

Who should be cautious

Contraindicated in cardiovascular disease, hypertension, hyperthyroidism, diabetes, glaucoma, urinary obstruction, anxiety, and in pregnancy and breastfeeding. Banned for non-prescription use in the U.S. Use only under medical supervision in regulated settings.

Interactions

Major interactions with MAO inhibitors (hypertensive crisis), other stimulants (caffeine, amphetamines, decongestants), antihypertensives (antagonism), digoxin, and many cardiac medications.

Frequently asked questions

Why is ma huang banned in the U.S.?⌄

The FDA prohibited sale of dietary supplements containing ephedrine alkaloids in 2004 because of serious cardiovascular events and deaths.

Is ephedra ever safe?⌄

Pharmaceutical ephedrine is used under medical supervision for specific conditions. Self-administration as a supplement is not safe.

References

Ma Huang on Wikidata — Wikidata link

Ma Huang on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Ma Huang (PubMed search) — PubMed link

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.