What's happening
High-dose omega-3 fatty acids (>3g/day EPA+DHA) have antiplatelet effects and may potentiate warfarin's anticoagulation, increasing bleeding risk. Mechanism involves reduced thromboxane A2 synthesis and altered platelet membrane fluidity.
Recommendation
Inform doctor if taking fish oil with warfarin. May need INR monitoring. Doses under 1g/day generally safe.
Timing
Monitor for bleeding signs; bruising, bloody nose, dark stools
Sources
- — American Journal of Cardiology
- — PMID: 15072218
- — PMID: 17056120