Can You Take Ibuprofen with Warfarin?
Last reviewed: · Source: US FDA drug label database
Avoid — ibuprofen increases bleeding risk and can significantly raise warfarin levels, increasing haemorrhage risk.
Is it safe to take Ibuprofen with Warfarin?
Ibuprofen and warfarin are a dangerous combination. Ibuprofen irritates the stomach lining, increasing the risk of GI bleeding — a risk that is dramatically higher when combined with warfarin's blood-thinning effect. Ibuprofen can also displace warfarin from plasma proteins, raising free warfarin levels and potentially causing the blood to become too thin. This combination has caused serious bleeding episodes. The NHS and FDA both advise against it except in specific circumstances under close medical supervision.
How do Ibuprofen and Warfarin interact?
Ibuprofen inhibits COX-1 and COX-2, reducing prostaglandins that protect the stomach lining, increasing ulcer and GI bleed risk. It also inhibits platelet aggregation (reversibly). Additionally, ibuprofen can displace warfarin from albumin binding sites, acutely raising free warfarin concentrations and unpredictably prolonging INR. This pharmacokinetic interaction is well-documented in FDA drug label data.
Data sourced from the US Food and Drug Administration (FDA) drug label database: FDA warfarin drug label — NSAID interaction warning; OpenFDA drug label data.
Who should be careful?
Anyone taking warfarin must be careful with all NSAIDs including ibuprofen, naproxen, and aspirin. If you need an anti-inflammatory, consult your anticoagulation clinic first.
What if I've already taken Ibuprofen and Warfarin?
Contact your GP or anticoagulation clinic for an urgent INR check. Watch for signs of unusual bleeding. Do not take more ibuprofen. In an emergency, call 999.
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Frequently Asked Questions
Can I take ibuprofen with warfarin?
No. Ibuprofen increases your bleeding risk in two ways: by irritating the stomach, and by potentially raising warfarin levels in your blood. Use paracetamol instead.
What painkiller is safe with warfarin?
Paracetamol is the safest option, but keep to the standard dose (max 4g/day, ideally no more than 2g/day if taking warfarin regularly) and inform your anticoagulation clinic. All NSAIDs should be avoided.
Can ibuprofen affect my INR?
Yes. Ibuprofen can raise free warfarin levels in your blood, which may increase your INR unpredictably, making your blood too thin and raising haemorrhage risk.
Can I use ibuprofen gel while on warfarin?
Topical ibuprofen gel is absorbed into the skin in small amounts. While less risky than tablets, it should still be used with caution and discussed with your anticoagulation clinic, particularly for prolonged use.