Drug interactions
Fish oil + Heparin
Severity: Minor
Fish oil 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
High-dose omega-3 fatty acids have mild antiplatelet effects. With heparin they may slightly increase bleeding tendency, though clinically significant bleeding is uncommon.
What this interaction means in plain words
Fish oil 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.
Fish oil belongs to Gastrointestinal Tract; Heparin belongs to Cardiovascular.
Why it happens
Omega-3 fatty acids modestly reduce platelet aggregation, adding to heparin anticoagulation.
What to do
Monitor for bleeding during co-therapy, especially with high doses or before procedures. No routine dose change is required.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Fish oil and Heparin, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
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 Fish oil
- Antithrombin alfa + Fish oil Moderate
- Antithrombin iii + Fish oil Moderate
- Aspirin / citric acid / sodium bicarbonate + Fish oil Moderate
- Aspirin + Fish oil Moderate
- Betrixaban + Fish oil Moderate
- Bivalirudin + Fish oil Moderate
Frequently asked questions
Can I take Fish oil with Heparin?
MediHelp rates the interaction as minor. Fish oil 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. High-dose omega-3 fatty acids have mild antiplatelet effects. With heparin they may slightly increase bleeding tendency, though clinically significant bleeding is uncommon.
How serious is the interaction between Fish oil 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: Monitor for bleeding during co-therapy, especially with high doses or before procedures. No routine dose change is required.
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.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
