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the claim

Ibuprofen may cause a severe allergic reaction in individuals who are allergic to aspirin.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
5 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that ibuprofen may cause a severe allergic reaction in individuals who are allergic to aspirin?

Yes. Evidence establishes that ibuprofen and aspirin share mechanisms (such as COX-1 inhibition) that can lead to cross-reactive hypersensitivity reactions, meaning individuals allergic or sensitive to aspirin may experience adverse reactions to ibuprofen.

Verdict: SUPPORTED · 5 sources for, 0 against · Last checked

The analysis

The retrieved literature consistently supports the concept that cross-reactivity exists among non-steroidal anti-inflammatory drugs (NSAIDs) such as aspirin and ibuprofen due to shared pharmacologic mechanisms like COX-1 inhibition. Multiple papers document these cross-intolerance phenotypes (such as N-ERD and NIUA), validating the claim that reactions can span across different NSAIDs.

Evidence for · 5
Updating the classification and routine diagnosis of NSAID hypersensitivity reactions: A WAO Statement.
2025
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A, R., RL, V., E, A., I, A., R, A., A, B., J, B., S, B., KN, C., P, D., I, D., MA, G. M., M, K., L, L., R, M., JS, M., HS, P., C, P., M, S., M, T., AA, W., M, A., M, A., MV, A., MP, B., L, B., K, B., L, B., C, C., YS, C., M, C., LF, E., BN, F., LH, G., P, G., E, G., S, K., M, L., C, M., F, M., M, P., V, P., C, P., E, P., E, P., M, R., L, S., E, S., LK, T., P, V., T, W., & M, Y. (2025). Updating the classification and routine diagnosis of NSAID hypersensitivity reactions: A WAO Statement.. doi.org. https://doi.org/10.1016/j.waojou.2025.101086

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More for · 4
Cross-Reactive NSAID Hypersensitivity: Clinical Findings From Aspirin Provocation and Alternative Drug Challenge Testing.
2025
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YI, K., JE, Y., & DW, S. (2025). Cross-Reactive NSAID Hypersensitivity: Clinical Findings From Aspirin Provocation and Alternative Drug Challenge Testing.. doi.org. https://doi.org/10.1111/cts.70335

Cross-Reactivity and Cross-Intolerance Among Nonsteroidal Anti-Inflammatory Drugs (NSAIDs): Clinical Patterns, COX-1-Mediated Mechanisms, and Implications for COX-2 Inhibitors and Paracetamol.
2026
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W, A., M, L., M, M., B, M., & K, G. (2026). Cross-Reactivity and Cross-Intolerance Among Nonsteroidal Anti-Inflammatory Drugs (NSAIDs): Clinical Patterns, COX-1-Mediated Mechanisms, and Implications for COX-2 Inhibitors and Paracetamol.. doi.org. https://doi.org/10.3390/ijms27093727

Suspected NIUAA after indobufen in a patient with ibuprofen allergy: a case report suggesting possible cross-reactivity.
2026
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L, L., J, L., Y, Y., & L, Z. (2026). Suspected NIUAA after indobufen in a patient with ibuprofen allergy: a case report suggesting possible cross-reactivity.. doi.org. https://doi.org/10.3389/fphar.2026.1932735

Labeled NSAID hypersensitivity and the risk of opioid prescribing; an observational study.
2025
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LC, A. E., R, A., S, A. A., & HI, A. (2025). Labeled NSAID hypersensitivity and the risk of opioid prescribing; an observational study.. doi.org. https://doi.org/10.3389/falgy.2025.1611309

What does the evidence say?

The retrieved literature consistently supports the concept that cross-reactivity exists among non-steroidal anti-inflammatory drugs (NSAIDs) such as aspirin and ibuprofen due to shared pharmacologic mechanisms like COX-1 inhibition. Multiple papers document these cross-intolerance phenotypes (such as N-ERD and NIUA), validating the claim that reactions can span across different NSAIDs.

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