Drug interactions
Heparin + Naproxen
Severity: Major
Heparin and Naproxen: major 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
Naproxen inhibits platelet function and can irritate the gastric mucosa, which adds to the bleeding tendency caused by heparin. This raises the risk of gastrointestinal and other hemorrhage.
What this interaction means in plain words
Heparin and Naproxen 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.
Heparin belongs to Cardiovascular; Naproxen belongs to Musculoskeletal.
Why it happens
Additive pharmacodynamic effect: NSAID-induced platelet inhibition and mucosal injury combined with heparin-mediated anticoagulation.
What to do
Avoid the combination where possible and use paracetamol or another non-NSAID analgesic. If it is unavoidable, monitor for bleeding, hemoglobin and aPTT or anti-Xa levels, and consider gastroprotection.
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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Other interactions of Naproxen
- Ketorolac intranasal + Naproxen Contraindicated
- Ketorolac + Naproxen Contraindicated
- Aceclofenac + Naproxen Major
- Acemetacin + Naproxen Major
- Acetylsalicylic acid + Naproxen Major
- Alteplase + Naproxen 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 Heparin with Naproxen?
MediHelp rates the interaction as major. Heparin and Naproxen 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. Naproxen inhibits platelet function and can irritate the gastric mucosa, which adds to the bleeding tendency caused by heparin. This raises the risk of gastrointestinal and other hemorrhage.
How serious is the interaction between Heparin and Naproxen?
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 the combination where possible and use paracetamol or another non-NSAID analgesic. If it is unavoidable, monitor for bleeding, hemoglobin and aPTT or anti-Xa levels, and consider gastroprotection.
What other medicines interact with Naproxen?
MediHelp also lists interactions of Naproxen with, for example, Ketorolac intranasal, Ketorolac, Aceclofenac. The full list is on the Naproxen page.
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