Drug interactions
Green tea + Heparin
Severity: Minor
Green tea and Heparin: minor interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Green tea has weak antiplatelet properties and its vitamin K content may oppose warfarin, but any effect on heparin is theoretical. Clinical evidence of a meaningful interaction with heparin is lacking.
What this interaction means in plain words
Green tea and Heparin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Green tea belongs to Gastrointestinal Tract; Heparin belongs to Cardiovascular.
Why it happens
Possible mild antiplatelet effect of green tea catechins; not an established interaction.
What to do
No change needed; monitor routinely for bleeding while on heparin.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Heparin
- Defibrotide + Heparin Contraindicated
- Heparin + Ketorolac Contraindicated
- Heparin + Oritavancin Contraindicated
- Acemetacin + Heparin Major
- Acetylsalicylic acid + Heparin Major
- Alteplase + Heparin Major
Other interactions of Green tea
- Adenosine + Green tea Moderate
- Benzphetamine + Green tea Moderate
- Bortezomib + Green tea Moderate
- Dextroamphetamine + Green tea Moderate
- Diethylpropion + Green tea Moderate
- Ephedrine + Green tea Moderate
Frequently asked questions
Can I take Green tea with Heparin?
MediHelp rates the interaction as minor. Green tea and Heparin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Green tea has weak antiplatelet properties and its vitamin K content may oppose warfarin, but any effect on heparin is theoretical. Clinical evidence of a meaningful interaction with heparin is lacking.
How serious is the interaction between Green tea and Heparin?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No change needed; monitor routinely for bleeding while on heparin.
What other medicines interact with Heparin?
MediHelp also lists interactions of Heparin with, for example, Defibrotide, Ketorolac, Oritavancin. The full list is on the Heparin page.
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