Drug interactions
Diclofenac + Heparin
Severity: Major
Diclofenac and Heparin: major interaction.
Last updated Sources: US FDA label
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
Diclofenac inhibits platelet function and can injure the gastric mucosa, so combined with heparin the risk of bleeding, particularly gastrointestinal, is increased. The effect is clinically relevant even though diclofenac does not change heparin's anticoagulant activity directly.
What this interaction means in plain words
Diclofenac and Heparin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Diclofenac belongs to Musculoskeletal; Heparin belongs to Cardiovascular.
Why it happens
Additive hemostatic impairment: NSAID-induced reversible platelet inhibition and mucosal damage plus heparin-mediated anticoagulation.
What to do
Avoid concurrent use where possible and choose paracetamol for analgesia. If unavoidable, use the lowest effective NSAID dose for the shortest time, consider gastroprotection and monitor for bleeding and hemoglobin.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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References
Other interactions of Diclofenac
- Diclofenac + Ketorolac Contraindicated
- Diclofenac + Ketorolac intranasal Contraindicated
- Aceclofenac + Diclofenac Major
- Acemetacin + Diclofenac Major
- Alteplase + Diclofenac Major
- Amiloride + Diclofenac Major
Other interactions of Heparin
- Defibrotide + Heparin Contraindicated
- Heparin + Ketorolac Contraindicated
- Heparin + Oritavancin Contraindicated
- Acemetacin + Heparin Major
- Acetylsalicylic acid + Heparin Major
- Alteplase + Heparin Major
Frequently asked questions
Can I take Diclofenac with Heparin?
MediHelp rates the interaction as major. Diclofenac and Heparin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Diclofenac inhibits platelet function and can injure the gastric mucosa, so combined with heparin the risk of bleeding, particularly gastrointestinal, is increased. The effect is clinically relevant even though diclofenac does not change heparin's anticoagulant activity directly.
How serious is the interaction between Diclofenac and Heparin?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid concurrent use where possible and choose paracetamol for analgesia. If unavoidable, use the lowest effective NSAID dose for the shortest time, consider gastroprotection and monitor for bleeding and hemoglobin.
What other medicines interact with Diclofenac?
MediHelp also lists interactions of Diclofenac with, for example, Ketorolac, Ketorolac intranasal, Aceclofenac. The full list is on the Diclofenac page.
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