Drug interactions
Omega 3 fatty acids + Warfarin
Severity: Minor
Omega 3 fatty acids and Warfarin: 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
High-dose omega-3 fatty acids have mild antiplatelet effects and may add to bleeding risk with warfarin. Clinically significant INR changes are uncommon at usual doses.
What this interaction means in plain words
Omega 3 fatty acids and Warfarin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Pharmacodynamic: omega-3 fatty acids mildly reduce platelet aggregation.
What to do
Monitor for bleeding and check INR when starting or substantially changing a high-dose omega-3 regimen.
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 Warfarin
- Defibrotide + Warfarin Contraindicated
- Ketorolac + Warfarin Contraindicated
- Abciximab + Warfarin Major
- Acetylsalicylic acid + Warfarin Major
- Adagrasib + Warfarin Major
- Amiodarone + Warfarin Major
Frequently asked questions
Can I take Omega 3 fatty acids with Warfarin?
MediHelp rates the interaction as minor. Omega 3 fatty acids and Warfarin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. High-dose omega-3 fatty acids have mild antiplatelet effects and may add to bleeding risk with warfarin. Clinically significant INR changes are uncommon at usual doses.
How serious is the interaction between Omega 3 fatty acids and Warfarin?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for bleeding and check INR when starting or substantially changing a high-dose omega-3 regimen.
What other medicines interact with Warfarin?
MediHelp also lists interactions of Warfarin with, for example, Defibrotide, Ketorolac, Abciximab. The full list is on the Warfarin page.
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