π Common Names (6 Languages)
β Evidence-Based Benefits
Popular immune stimulant with extensive research. Meta-analysis of 14 RCTs shows echinacea reduces cold duration by 1.4 days and decreases odds of developing cold by 58% (PMID: 17597571). Cochrane review suggests modest benefit for cold prevention and treatment but results vary by preparation (PMID: 24554461). May reduce severity of upper respiratory symptoms. Traditional Native American medicine for infections and wound healing.
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π¬ Clinical Trials & Evidence
βοΈ Evidence-Based Research: Clinical trials provide the highest level of evidence for herbal efficacy and safety. The trials listed below represent peer-reviewed research registered on ClinicalTrials.gov. Each trial includes detailed protocols, patient populations, interventions tested, and measurable outcomes. Click links to access full trial details and published results.
Meta-analysis: 58% reduction in cold incidence
Cochrane review: Modest cold prevention benefit
π Find More Clinical Trials
Search for additional ongoing and completed trials investigating this herb's therapeutic effects:
π‘ Research Tip: Use both common name and scientific name when searching for comprehensive results. Filter by "Completed" trials to find published outcomes.
π Drug Interactions
β οΈ CRITICAL SAFETY INFORMATION
Herb-drug interactions can be serious and potentially life-threatening. Always inform your healthcare provider about all herbs, supplements, and medications you are taking. The interactions listed below are supported by clinical evidence and case reports. Citations link to peer-reviewed research on PubMed.
π Evidence-Based Interactions: Each interaction below includes research citations (PMID links) documenting the mechanism, clinical significance, and management recommendations. Click citations to access full studies.
β οΈ Immunosuppressants (Cyclosporine, Tacrolimus, Corticosteroids)
Risk: May reduce immunosuppressant effectiveness
Mechanism: Immune-stimulating properties
Action: AVOID in transplant patients and those on immunotherapy
CYP450 Substrates (CYP3A4, CYP1A2)
Effect: May induce or inhibit drug metabolism
Action: Monitor levels of medications metabolized by CYP enzymes
Caffeine
Effect: May increase caffeine levels (inhibits CYP1A2)
Action: Monitor for jitteriness, insomnia if using both
Hepatotoxic Medications
Effect: Rare hepatotoxicity reported with long-term use
Action: Avoid use beyond 8 weeks. Monitor liver enzymes with chronic use
π Key Interaction Databases & Resources
- Natural Medicines Database: Professional herb-drug interaction checker
- PubMed: Search for latest interaction research
- Drugs.com: Drug interaction checker
- Micromedex: Hospital-grade interaction database (subscription required)
π‘ Clinical Tip: Show your healthcare provider this page and the linked research citations when discussing potential interactions.
β οΈ Safety Information
Adverse Events
Generally safe with low adverse event rate. Gastrointestinal upset (5-10% users). Allergic reactions in Asteraceae-sensitive individuals (rash, anaphylaxis rare). Contraindicated in autoimmune disease (theoretical immune stimulation). Not recommended for children under 12 without supervision.
β Contraindications
AVOID in autoimmune diseases (multiple sclerosis, lupus, rheumatoid arthritis). Contraindicated in HIV/AIDS (theoretical immune overstimulation). Avoid in tuberculosis. Allergy to Asteraceae family. May interact with immunosuppressants. Discontinue before surgery.
𧬠Mechanism of Action
Alkylamides, polysaccharides, and caffeic acid derivatives provide immunomodulatory effects via: macrophage activation, increased phagocytosis, enhanced natural killer cell activity, cytokine production (IL-1, IL-6, TNF-Ξ±), and interferon stimulation. Anti-inflammatory via COX-2 inhibition.
π Dosage & Administration
300mg standardized extract 3 times daily at first sign of cold. Continue for 7-10 days maximum per episode. For prevention: 300-500mg daily during cold season. Preparations vary widely - aerial parts of E. purpurea most studied. Fresh juice: 6-9ml daily. Tincture: 2-3ml three times daily. Do not use continuously >8 weeks.
βοΈ Note: Consult healthcare provider for appropriate dosing, especially if taking medications.
π Additional Resources
π WHO Monograph
Available in WHO Monographs on Selected Medicinal Plants
π¬ PubMed Search
π§ͺ ClinicalTrials.gov
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Data Retrieval Date: November 29, 2025
Compiled by: Sheraz Ahmed
License: CC BY-SA 4.0
Citation: Ahmed, S. (2025). Medicinal Herbs Database. Clinical Corner. https://welovelmc.com/medical-tools.htm