Can I Take These?

Can You Take Aspirin and Ibuprofen Together?

Ibuprofen can interfere with aspirin's antiplatelet protection, but the FDA-documented timing relationship depends on aspirin's formulation and dosing order -- there is no single universal spacing rule.

Use cautionEvidence: High

See the full Aspirin page and Ibuprofen page for other reviewed interactions and reference information.

What the interaction means

Aspirin's FDA prescribing information (DURLAZA), Section 7, "Nonsteroidal Anti-inflammatory Drugs (NSAIDs)," states: "Ibuprofen can interfere with the anti-platelet effect of low dose aspirin. Patients who use DURLAZA and take a single dose of ibuprofen 400 mg should dose the ibuprofen at least 2-4 hours or longer after ingestion of DURLAZA" -- an instruction specific to DURLAZA, an extended-release aspirin product. A separate ibuprofen FDA label's own pharmacodynamic studies give more general, formulation-specific detail: "The interaction exists even following a once-daily regimen of ibuprofen 400 mg, particularly when ibuprofen is dosed prior to aspirin. The interaction is alleviated if immediate-release low-dose aspirin is dosed at least 2 hours prior to a once daily regimen of ibuprofen; however, this finding cannot be extended to enteric-coated low-dose aspirin." In the underlying study, dosing ibuprofen 2 hours before immediate-release 81 mg aspirin reduced aspirin's antiplatelet effect (53% thromboxane inhibition), while dosing ibuprofen 2 hours after preserved it (99.2%) -- but with enteric-coated aspirin, reduced inhibition (67%) was seen regardless of the timing tested. Ibuprofen's own label separately states concomitant use with aspirin "is not generally recommended because of the potential for increased adverse effects."

Why it may happen

Ibuprofen and aspirin compete for the same binding site on platelet COX-1. If ibuprofen occupies that site first, it can reversibly block aspirin's access, blunting aspirin's irreversible antiplatelet effect. This competition is sequence-dependent (which drug is taken first, and how long before) and formulation-dependent (immediate-release vs. enteric-coated aspirin behave differently), not a fixed interval. Combined NSAID use also independently raises bleeding and renal-impairment risk.

Practical context

This matters most for people taking daily low-dose aspirin for heart attack or stroke protection who also use ibuprofen for pain or fever. The evidence reviewed does not support one universal spacing instruction: the timing relationship documented on these labels differs by aspirin formulation (immediate-release vs. enteric-coated) and by which drug is taken first, and this site's timing engine cannot safely represent that many conditions as a single interval. Anyone taking aspirin for cardioprotection who wants to add ibuprofen -- occasionally or regularly -- should ask their pharmacist or clinician about the correct sequencing for their specific aspirin product before doing so, rather than relying on a generic "wait N hours" rule.

What the sources say

Ibuprofen Tablets, USP — FDA Prescribing Information — Ascend Laboratories, LLC (via DailyMed, U.S. National Library of Medicine)DURLAZA (Aspirin) Extended-Release Capsules — FDA Prescribing Information — New Haven Pharmaceuticals, Inc. (via DailyMed, U.S. National Library of Medicine)Ibuprofen 400 mg, 600 mg and 800 mg Tablets — FDA Prescribing Information — Time-Cap Laboratories, Inc. (via DailyMed, U.S. National Library of Medicine)

Last reviewed 2026-08-24

Medical information disclaimer: this information is general and educational. It does not diagnose conditions, prescribe treatment, or determine whether a combination is safe for you personally. Follow your prescription label and ask a pharmacist or clinician before starting, stopping, or combining products. Full disclaimer.

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