Can You Take Naproxen with Warfarin?
Last reviewed: · Source: US FDA drug label database
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Like ibuprofen, naproxen must be avoided with warfarin — it dramatically raises bleeding risk and may raise INR unpredictably. Paracetamol is the safe alternative.
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- Naproxen adds its own bleeding risk on top of warfarin's anticoagulant effect, through a different mechanism, just like ibuprofen.
- Naproxen's longer duration of action means this risk window is longer than with shorter-acting NSAIDs.
- Paracetamol is the recommended safe alternative for pain relief if you're on warfarin.
- Watch for unusual bruising, bleeding gums, blood in urine or stool, or any sign of unusual bleeding, and seek urgent care if these occur.
Is it safe to take Naproxen with Warfarin?
Naproxen carries the same serious bleeding interaction with warfarin as ibuprofen and all other NSAIDs. It inhibits platelet function, irritates the gastric mucosa, and can displace warfarin from protein binding — all on top of warfarin's anticoagulant effect. The result is dangerously elevated bleeding risk. Naproxen's longer half-life (12-17 hours) means the interaction persists longer than shorter-acting NSAIDs. Never use naproxen as a regular painkiller on warfarin.
How do Naproxen and Warfarin interact?
Same class interaction as warfarin-and-ibuprofen. NSAIDs as a class are incompatible with warfarin for regular use: platelet COX-1 inhibition + mucosal damage + possible warfarin displacement from albumin. INR can rise unpredictably, especially in elderly patients.
Data sourced from the US Food and Drug Administration (FDA) drug label database: FDA warfarin label — NSAID class interaction; OpenFDA naproxen label.
Interaction severity
Rated major: like ibuprofen, naproxen compounds warfarin's bleeding risk through its own antiplatelet and stomach-irritating effects, and can also unpredictably affect INR — a well-documented, dangerous combination to avoid rather than manage.
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Home blood pressure and heart rate monitor — important for patients on anticoagulants.
Check Price →Keep track of your daily warfarin dose with a clearly labelled weekly pill organiser.
Check Price →Alert medical staff to your anticoagulant use in an emergency.
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All patients on warfarin. The interaction is class-wide — all NSAIDs carry this risk. Paracetamol is the universally recommended alternative (with INR monitoring for regular use).
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What if I've already taken Naproxen and Warfarin?
Stop the naproxen. Arrange an urgent INR check. Watch for bleed signs: black stools, blood in urine, unusual bruising. Emergency department for any significant active bleed.
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Not sure if this combination is safe for your specific situation?
HealthLabs.com lets you check liver enzyme or kidney function levels before combining medications long-term — no GP referral needed.
Check your levels at HealthLabs →Always speak to your pharmacist or GP for personalised medical advice. Affiliate link — we may earn a commission.
Frequently Asked Questions
Can I take naproxen with warfarin?
No — like all NSAIDs, naproxen is contraindicated with warfarin due to severely elevated bleeding risk. Paracetamol is the safe alternative.
Is naproxen worse than ibuprofen with warfarin?
Both are dangerous with warfarin. Naproxen's longer half-life means the interaction lasts longer, but the overall risk profile is similarly high.
What painkiller is safe on warfarin?
Paracetamol — used at the lowest effective dose. Get an extra INR check if taking it daily for more than 3-5 days. See our warfarin and paracetamol page.
Can I take naproxen just once on warfarin?
Even a single dose of a full-strength NSAID can raise INR and platelet dysfunction. It is best avoided even as a one-off.