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

Questions fréquentes

How does Ephedra equisetina work as a bronchodilator?

Ephedra equisetina contains ephedrine and pseudoephedrine, which act as sympathomimetic amines. These compounds stimulate alpha and beta-adrenergic receptors, causing relaxation of bronchial smooth muscle and bronchodilation. Ephedrine also promotes norepinephrine release, enhancing airway opening. This dual mechanism makes it effective for respiratory conditions like asthma. The bronchodilatory effect typically begins within 30-60 minutes of oral administration. Evidence level: C, based on pharmacological studies and traditional use.

What are the drug interactions of Ephedra equisetina?

Ephedra equisetina has significant drug interactions due to its ephedrine content. It should never be combined with MAO inhibitors, as this can cause hypertensive crisis. Concurrent use with stimulants like caffeine or decongestants increases cardiovascular risks. Ephedra may reduce beta-blocker and antihypertensive medication effectiveness. It can interact with cardiac glycosides, increasing arrhythmia risk. Patients taking thyroid medications, diabetes drugs, or antidepressants should avoid Ephedra. Always consult a healthcare provider before combining with prescription medications.

What is the recommended dosage for Ephedra equisetina?

The typical adult dosage for Ephedra equisetina is 1-3 grams of dried herb daily, prepared as a decoction. This dosage is regulated in many countries due to ephedrine content. Standardized preparations typically provide 15-30mg ephedrine per dose. Use should be limited to short-term applications (no more than 7 days) and under professional supervision. Higher doses significantly increase adverse cardiovascular effects. Evidence level: C, Traditional use. Regulatory restrictions apply in many jurisdictions.

Is Ephedra equisetina safe during pregnancy?

Ephedra equisetina is unsafe during pregnancy and breastfeeding. Ephedrine crosses the placenta and may cause fetal tachycardia and developmental concerns. During breastfeeding, ephedrine passes into breast milk, potentially causing irritability and sleep disturbances in nursing infants. The herb's uterine-stimulating properties pose additional risk of premature labor. Pregnant individuals with respiratory conditions should seek alternative treatments under medical supervision. Ephedra is contraindicated throughout pregnancy and lactation.

What are the side effects of Ephedra equisetina?

Ephedra equisetina can cause significant cardiovascular and central nervous system side effects. Common effects include elevated blood pressure, tachycardia, palpitations, anxiety, insomnia, and headache. More serious adverse effects include cardiac arrhythmias, myocardial infarction, and stroke, particularly at higher doses or with prolonged use. Individuals with cardiovascular disease, hypertension, or anxiety disorders face increased risk. Due to these safety concerns, Ephedra products are regulated or banned in several countries. Evidence level: C.

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 22 articles PubMed · modèle : gemma4:31b

Résumé

Ephedra equisetina is a medicinal plant species used in traditional Chinese and Japanese medicine, containing alkaloids and phenolic compounds with potential anti-asthmatic and antioxidant activities [PMID:36641108, 39306843].

Contexte

Ephedra equisetina Bunge is a terrestrial shrub species belonging to the Ephedraceae family [PMID:31685738, 36840134]. It is one of the official origins of 'Ephedrae herba' (Mahuang) as defined in the Japanese Pharmacopoeia [PMID:31685738].

Usages traditionnels

It has a long history of use in traditional Chinese and Japanese (Kampo) medicine, commonly utilized for treating colds, bronchial asthma, and nasal congestion [PMID:19571392, 36641108]. It has also been used in Central Asian folk medicine [PMID:39306843].

Composés actifs

The plant contains ephedrine alkaloids (including ephedrine and pseudoephedrine) [PMID:31685738, 30930415], cyclotrypyamine alkaloids (equisetinines A and B) [PMID:35611800], flavonoids, phenols [PMID:38301946], lignans (equiselignan A-F), and terpenoids (equiseterpenoid A-E) [PMID:35568259]. It is also rich in catechins, including catechin and epicatechin [PMID:36416500].

Mécanisme d'action

Aqueous root extracts have been shown to induce cyanobacterial cell death by disrupting the thylakoid membrane, interrupting electronic transport, and decreasing effective quantum yield, leading to photosynthesis failure in Microcystis aeruginosa [PMID:22870313].

Preuves cliniques

Preuve DAsthma (In vitro)

Various isolated compounds, including equisetinine 5 [PMID:35611800], specific flavonoids and phenols (compounds 3, 8, 10, 11) [PMID:38301946], and certain lignans and terpenoids (equiselignan B and equiseterpenoid B) [PMID:35568259], exhibited anti-asthmatic activities by inhibiting β-Hex release in C48/80-induced RBL-2H3 cells.

Preuve DOxidative Stress (In vitro)

Aqueous extracts of E. equisetina demonstrated strong antioxidant activities in scavenging ABTS and DPPH radicals and in total reducing power [PMID:39306843].

Sécurité et effets indésirables

Ephedra Herb (which includes E. equisetina) is associated with adverse effects such as palpitation, excitation, insomnia, and dysuria, traditionally attributed to ephedrine alkaloids [PMID:31685738].

Synthèse des preuves

The current evidence is primarily based on in vitro bioactive assays and phytochemical characterization (Level D). There are no clinical trial data provided in the abstracts for E. equisetina specifically.

Sources PubMed

1.PMID: 35611800 (2022) — Alkaloids from the stem of Ephedra equisetina. · Journal of Asian natural products research
2.PMID: 38301946 (2024) — Flavonoids and phenols from the stems of Ephedra equisetina. · Phytochemistry
3.PMID: 38479617 (2024) — Five new compounds from the stems of Ephedra equisetina. · Fitoterapia
4.PMID: 39183892 (2024) — Predicting the spatial distribution of three Ephedra species under climate change using the MaxEnt model. · Heliyon
5.PMID: 35568259 (2022) — Lignans and terpenoids from the stem of Ephedra equisetina Bunge. · Phytochemistry
6.PMID: 36840134

Ephedra equisetina

Sources et citations

Calculer une dose sûre de Ephedra equisetina

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Questions fréquentes

Résumé

Contexte

Usages traditionnels

Composés actifs

Mécanisme d'action

Preuves cliniques

Sécurité et effets indésirables

Synthèse des preuves

Sources PubMed

Sources gouvernementales

Ephedra equisetina

Sources et citations

Calculer une dose sûre de Ephedra equisetina

Plantes associées

Robinia pseudoacacia

Castanea sativa

Fagus sylvatica

Questions fréquentes

Résumé

Contexte

Usages traditionnels

Composés actifs

Mécanisme d'action

Preuves cliniques

Sécurité et effets indésirables

Synthèse des preuves

Sources PubMed

Sources gouvernementales