Aspirin and Fondaparinux interaction
Aspirin and Fondaparinux: both prescribing labels flag this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.
Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.
What the FDA labels say
From the Fondaparinux (Fondaparinux Sodium) label · effective 2024-12-15
…risk of developing epidural or spinal hematomas in these patients include: • use of indwelling epidural catheters • concomitant use of other drugs that affect hemostasis, such as non-steroidal anti-inflammatory drugs (NSAIDs), platelet inhibitors, or other anticoagulants • a history of traumatic or repeated epidural or spinal puncture • a history of spinal deformity…
The risk of these events may be higher with post-operative use of indwelling epidural catheters or concomitant use of other drugs affecting hemostasis such as NSAIDs [see Boxed Warning ] .
In clinical studies performed with fondaparinux sodium, the concomitant use of oral anticoagulants (warfarin sodium), platelet inhibitors (acetylsalicylic acid), NSAIDs (piroxicam), and digoxin did not significantly affect the pharmacokinetics/pharmacodynamics of fondaparinux sodium.
From the Aspirin label · effective 2026-05-06
The chance is higher if you are age 60 or older take a blood thinning (anticoagulant) or steroid drug have 3 or more alcoholic drinks every day while using this product have had stomach ulcers or bleeding problems take more or for a longer time than directed take other drugs containing prescription or nonprescription NSAIDs [aspirin, ibuprofen, naproxen, or others]…
Taking more than these two? Interactions stack. Check your whole list at once; it stays in your browser.
Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.