⚠️ Mechanism
Green Tea is a weak inhibitor of CYP3A4, which decreases metabolism of CYP3A4 substrates, potentially increasing their plasma concentrations and risk of adverse effects.
📋 Effect
Increased plasma levels of ethinylestradiol (oral-contraceptives), potentially leading to toxicity or enhanced adverse effects.
💊 Management
Monitor for increased adverse effects of ethinylestradiol. Dose reduction may be necessary. Consider alternative supplement or consult healthcare provider.
Plain Language Summary
This combination carries a moderate risk because green tea can cause the levels of oral contraceptives in your body to increase. This buildup may lead to a higher chance of experiencing side effects from the medication.
Source
Flockhart CYP450 Table (drug-interactions.medicine.iu.edu)
Supporting Research
The effect of Green green tea consumption on body mass index, lipoprotein, liver enzymes, and liver cancer: An updated systemic review incorporating a meta-analysis
Green Tea Consumption and Risk of Breast Cancer and Recurrence-A Systematic Review and Meta-Analysis of Observational Studies
Green tea (Camellia sinensis) for the prevention of cancer
The Effect of Antioxidant Polyphenol Supplementation on Cardiometabolic Risk Factors: A Systematic Review and Meta-Analysis
Green tea consumption and risk of pancreatic cancer: a meta-analysis
Safety and Effectiveness of Oral Nutraceuticals for Treating Acne: A Systematic Review
Dietary Strategies for Weight Loss Maintenance
Green and black tea for the primary prevention of cardiovascular disease
Medical Disclaimer: This interaction record is for informational and educational purposes only and does not constitute medical advice. Drug-supplement interactions can be dangerous. Always consult your healthcare provider or pharmacist before combining any supplement with prescription medications. Do not stop or change any medication without professional guidance.