Ortie (Urtica dioica): Benefits, Dosage, Safety & Evidence

Qu'est-ce qu'une interaction plante-médicament ?

Une interaction plante-médicament se produit lorsqu'une plante ou un complément modifie l'action d'un médicament dans votre organisme — en le rendant plus puissant, moins efficace, ou plus susceptible de provoquer des effets nocifs. Les plantes contiennent des composés actifs qui peuvent accélérer ou ralentir les enzymes et transporteurs utilisés pour métaboliser les médicaments.

Pourquoi c'est important

Millepertuis peut rendre la contraception, les antidépresseurs et les anticoagulants moins efficaces.

Ail peut augmenter le risque de saignement avec la warfarine et autres anticoagulants (aussi ginkgo, gingembre et curcuma).

Kava peut amplifier la sédation avec les médicaments contre l'anxiété ou le sommeil (aussi la valériane).

Le risque est plus élevé chez les personnes âgées, ceux qui prennent plusieurs médicaments et les personnes atteintes de maladies chroniques.

Indiquez toujours à votre médecin et à votre pharmacien toutes les plantes et compléments que vous prenez — et vérifiez ci-dessous avant toute association.

Interactions Médicamenteuses Connues (2)

1 Modéré1 Léger

Médicament	Sévérité	Description
Lithium	Modéré	L'effet diurétique de l'ortie peut augmenter la concentration de lithium en réduisant son excrétion, risquant une toxicité.
Antihypertensives	Léger	La pissenlit peut avoir des effets légers abaissant la pression artérielle qui s'ajoutent aux médicaments antihypertenseurs.

Cette liste reflète un sous-ensemble sélectionné d'interactions documentées et n'est pas exhaustive. L'absence d'un médicament ici ne prouve pas qu'il est sans danger à combiner. Confirmez toujours auprès d'un pharmacien ou d'un professionnel de santé.

Questions fréquentes

How does stinging nettle work to reduce inflammation and allergies?

Nettle contains several bioactive compounds that modulate inflammatory pathways. Research suggests it inhibits cyclooxygenase and lipoxygenase enzymes, reducing prostaglandin and leukotriene production (Evidence Level B). Additionally, nettle appears to block histamine receptors and may reduce the release of inflammatory cytokines. These mechanisms help explain its traditional use for seasonal allergies and joint inflammation. The presence of scopoletin and beta-sitosterol contributes to these anti-inflammatory effects.

Can I take stinging nettle with blood pressure medication or diuretics?

Nettle has natural diuretic properties and may enhance the effects of antihypertensive medications and prescription diuretics (Evidence Level C). This combination could potentially cause blood pressure to drop too low or lead to dehydration and electrolyte imbalances. Patients taking lithium should avoid nettle entirely, as increased diuresis can raise lithium to toxic levels. Always consult a healthcare provider before combining nettle with any cardiovascular medications.

What is the recommended dosage for stinging nettle leaf?

The standard adult dosage for nettle leaf is 300-600mg of freeze-dried extract taken 2-3 times daily (Evidence Level B). For tea, steep 1-2 teaspoons of dried leaf in hot water for 10-15 minutes, consuming 2-4 cups daily. For benign prostatic hyperplasia, nettle root extracts of 120-240mg daily have been studied. Start with lower doses to assess tolerance, and always follow product-specific recommendations from reputable manufacturers.

Is stinging nettle safe to take during pregnancy?

Nettle is considered unsafe during pregnancy and should be avoided (Evidence Level D). The herb may stimulate uterine contractions and has been used traditionally to induce menstruation, posing a potential miscarriage risk. While nettle leaf is sometimes recommended as a nutritive prenatal tonic by some herbalists, the safety data is insufficient. Pregnant individuals should consult a qualified healthcare provider before using any herbal supplements. Breastfeeding women should also exercise caution due to limited safety data.

Does stinging nettle really help with joint pain and arthritis?

Clinical research suggests nettle may provide relief for osteoarthritis and joint pain (Evidence Level B). Studies indicate that topical application of fresh nettle leaves can reduce pain, likely through the counter-irritant effect of formic acid. Oral supplementation with nettle has shown modest benefits in reducing osteoarthritis symptoms, particularly when combined with conventional treatments. The anti-inflammatory compounds, including beta-sitosterol, may help modulate inflammatory pathways involved in joint degradation.

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

Stinging nettle (Urtica dioica L.) is a wild herbaceous perennial plant with nutritional and medicinal properties used globally [PMID:35800714, PMID:36014458].

Contexte

Urtica dioica is a common, multi-purpose herbaceous perennial blooming plant found in Europe, Asia, North Africa, and North America [PMID:35800714, PMID:36014458]. It is often considered a weed due to its invasive capacity and fast growth, though it is suitable for cultivation as a beneficial crop for food, medicine, and fiber production [PMID:39861633, PMID:35744347].

Usages traditionnels

Traditionally, the roots are used to treat mictional difficulties associated with benign prostatic hyperplasia, while the leaves are used for arthritis, rheumatism, and allergic rhinitis [PMID:35800714]. It has also been used as a postpartum tonic for treating anemia and as a purported galactogogue in nursing mothers [PMID:37011125].

Composés actifs

Bioactive constituents include flavonoids (such as rutin and kaempferol), phenolic acids (caffeoylmalic, chlorogenic, neochlorogenic, and cichoric acids), carotenoids, fatty acids, and vitamins [PMID:36014458, PMID:36771171]. Roots are specifically rich in phytosterols, lignans, coumarins, sugars, and lectins (Urtica dioica agglutinin) [PMID:39861633, PMID:31717749].

Mécanisme d'action

Potential mechanisms include the inhibition of HMGCoA reductase and amelioration of lipid peroxidation via antioxidant effects [PMID:35911652]. Quercetin is noted for decreasing total cholesterol [PMID:35911652]. Hypothetically, galactogogue effects may result from the binding of sex hormone-binding globulin by polar extracts, leading to elevated serum estrogen levels [PMID:37011125]. Leaf extracts may act as P2-purinoceptor antagonists [PMID:35900970].

Preuves cliniques

Preuve CBenign Prostatic Hyperplasia

Root extracts are purported to relieve urinary symptoms [PMID:37011125] and prevent some effects of prostatic hyperplasia [PMID:31163183].

Preuve CInflammatory Conditions (Arthritis/Rheumatism)

Leaves are used to treat arthritis and rheumatism [PMID:35800714]; leaf extracts are used as anti-inflammatory remedies for rheumatoid arthritis [PMID:31163183].

Preuve CMetabolic Syndrome/Hypertension

Traditionally used to control cardiovascular disorders and hypertension; suggested mechanisms involve alterations in potassium and calcium channels [PMID:31163183, PMID:35911652].

Preuve DMale Fertility

In mouse mating studies, daily oral administration of 50 mg of leaf extract reduced male fertility by 53% [PMID:35900970].

Grossesse et allaitement

Preparations have been used orally by nursing mothers as a postpartum tonic for anemia and as a galactogogue [PMID:37011125].

Synthèse des preuves

The evidence is primarily based on reviews and traditional use (Level C), with some animal-model data (Level D) regarding fertility and neuroprotection. There is a lack of high-level clinical trial data (Level A/B) in the provided abstracts.

Sources PubMed

1.PMID: 35800714 (2022) — Nutritional and pharmacological importance of stinging nettle (Urtica dioica L.): A review. · Heliyon
2.PMID: 36014458 (2022) — Stinging Nettle (Urtica dioica L.): Nutritional Composition, Bioactive Compounds, and Food Functional Properties. · Molecules (Basel, Switzerland)
3.PMID: 37011125 (2012) — Herbal Teas and their Health Benefits: A Scoping Review. · Plant foods for human nutrition (Dordrecht, Netherlands)
4.PMID: 14744424 (2003) — Stinging nettle dermatitis. · American journal of contact dermatitis : official journal of the American Contact Dermatitis Society
5.PMID: 29632497 (2018) — Urtica dioica (Stinging Nettle): A Neglected Plant With Emerging Growth Promoter/Immunostimulant Properties for Farmed Fish. · Frontiers in physiology

Ortie

Sources et citations

Calculer une dose sûre de Ortie

⚠️ Non recommandé pendant la grossesse ou l'allaitement

2 interactions médicamenteuses connues — Certaines peuvent être graves

Contre-indications

Effets secondaires possibles