Ephedra sinica (Ephedra sinica): Benefits, Dosage, Safety & Evidence

Questions fréquentes

How does Ephedra sinica work in the body?

Ephedra sinica works primarily through its alkaloids ephedrine and pseudoephedrine, which stimulate alpha and beta-adrenergic receptors. These compounds mimic adrenaline, causing bronchial smooth muscle relaxation, increased heart rate, and elevated blood pressure. The bronchodilatory effect explains its traditional use for respiratory conditions. Evidence Level: C. This mechanism also underlies its cardiovascular risks and regulatory status in many countries.

What drugs interact with Ephedra sinica?

Ephedra sinica has significant drug interactions. It should not be combined with MAO inhibitors, which can cause hypertensive crisis. Concurrent use with other stimulants like caffeine or decongestants increases cardiovascular risks. It may reduce effectiveness of beta-blockers and antihypertensive medications. Combining with cardiac glycosides increases arrhythmia risk. Evidence Level: C. These interactions contributed to FDA restrictions on ephedra supplements.

What is the recommended dosage for Ephedra sinica?

Traditional adult dosages ranged from 1-6 grams of dried herb daily, typically prepared as a decoction. However, Ephedra sinica is now heavily regulated or banned in many countries due to cardiovascular risks. Self-medication is strongly discouraged. Pharmaceutical ephedrine preparations, when prescribed, follow strict dosing protocols. Evidence Level: C. Professional guidance is essential given the herb's narrow therapeutic window and regulatory status.

Is Ephedra sinica safe during pregnancy?

Ephedra sinica is contraindicated during pregnancy and breastfeeding. The ephedrine content can cause uterine stimulation, increased maternal blood pressure, and fetal distress. Historical use for inducing labor reflects its uterine effects. The herb's cardiovascular stimulation poses additional risks during pregnancy when blood volume and cardiac output are naturally elevated. Evidence Level: C. Pregnant individuals should avoid all ephedra-containing products.

What is Ephedra sinica used for?

Ephedra sinica has been used traditionally for respiratory conditions including asthma, bronchitis, and nasal congestion. Its bronchodilatory effects made it valuable in traditional Chinese medicine for thousands of years. Historically, it was also marketed for weight loss and athletic performance enhancement. Evidence Level: C. Modern use is restricted in many countries due to cardiovascular risks. Pharmaceutical ephedrine and pseudoephedrine remain common in decongestants.

Fiche d'information compilée à partir de PubMed

Cette fiche a été compilée à partir de résumés PubMed (NIH) avec l'assistance d'une IA. Chaque affirmation factuelle est citée par un article PubMed réel (voir la liste des sources). Elle n'a pas encore été révisée par un humain — confirmez auprès d'un professionnel de santé avant utilisation.

Compilé à partir de 28 articles PubMed · modèle : gemma4:31b

Résumé

Ephedra sinica, also known as Ma Huang, is a traditional Chinese medicinal shrub used as a stimulant and antiasthmatic agent [PMID:31644021, PMID:21365072].

Contexte

Ephedra sinica is a dioecious, perennial, evergreen shrub that is drought- and frost-resistant [PMID:18273806]. It has been used in China for medicinal purposes for several thousand years [PMID:21365072].

Usages traditionnels

Used in traditional Chinese medicine for centuries as a stimulant and antiasthmatic agent [PMID:31644021], and to treat asthma, nose and lung congestion, and fever with anhidrosis [PMID:10911002].

Composés actifs

The plant contains ephedrine alkaloids, with ephedrine accounting for 30% to 90% of the total alkaloids (which make up 0.5-2.5% by weight) [PMID:10911002, PMID:31644021]. It also contains a complex mixture of proanthocyanidin oligomers, with (-)-epigallocatechin as a main extension unit [PMID:28783085].

Mécanisme d'action

Ephedrine acts on adrenoceptors with separate alpha and beta effects [PMID:21365072]. Extracts of E. sinica may induce browning of white adipocytes by up-regulating browning markers such as uncoupling protein 1 (UCP1) and increasing mitochondrial activity [PMID:35407115].

Preuves cliniques

Preuve CObesity/Weight Loss

Used as a weight loss agent; some reviews suggest weight loss and athletic performance may be only modestly improved for short durations [PMID:31644021, PMID:15040625].

Preuve DAsthma/Pulmonary Fibrosis

In a rat model of bleomycin-induced idiopathic pulmonary fibrosis, Ephedra demonstrated significantly reduced alveolitis and pulmonary fibrosis grades compared to a model group [PMID:24854661].

Preuve AAllergic Rhinitis

Ma-Huang-Fu-Zi-Xi-Xin decoction has been evaluated for treatment effects and safety in patients with allergic rhinitis [PMID:29636787].

Sécurité et effets indésirables

Ephedra is linked to severe side effects, including clinically apparent liver injury [PMID:31644021, PMID:10948380, PMID:31643904, PMID:26357619]. Cardiovascular toxicities include hemorrhage, necrosis, and degeneration in the ventricles or interventricular septum, particularly when combined with caffeine [PMID:17676524]. Other reported toxicities include nephrolithiasis (kidney stones) [PMID:9669437] and fatal poisoning cases [PMID:10911002]. Due to these risks, it has been banned for sale in the United States and other regions [PMID:31644021, PMID:21365072, PMID:16212144].

Interactions médicamenteuses

Ma huang is cited in interaction reports as a herbal drug that may interact with conventional medicines [PMID:15794726].

Synthèse des preuves

The evidence consists primarily of narrative reviews, case reports, and animal studies. While traditional use is extensive, modern clinical evidence for efficacy is limited, and there is significant evidence of severe safety risks (hepatotoxicity and cardiotoxicity), leading to regulatory bans in several countries.

Sources PubMed

1.PMID: 36479472 (2022) — Dietary supplements for obesity. · Journal of preventive medicine and hygiene
2.PMID: 31644021 (2012) — Herb-induced liver injury: Systematic review and meta-analysis. · World journal of clinical cases
3.PMID: 10948380 (2000) — Hepatotoxicity of botanicals. · Public health nutrition
4.PMID: 12108613 (2002) — Ma huang toxicity. · Mayo Clinic proceedings
5.PMID: 12916063 (2003) — Ephedra in perspective--a current review. · Phytotherapy research : PTR
6.PMID: 31643904

Ephedra sinica

Sources et citations

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