Drug interactions
Diflunisal + Naproxen
Severity: Major
Diflunisal and Naproxen: major interaction.
Last updated Sources: US FDA label
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Taking two NSAIDs together increases the risk of gastrointestinal ulcers and bleeding, kidney injury and cardiovascular events without added analgesic benefit.
What this interaction means in plain words
Diflunisal and Naproxen can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Diflunisal belongs to Musculoskeletal; Naproxen belongs to Musculoskeletal.
Why it happens
Additive cyclooxygenase inhibition reducing gastric, platelet and renal prostaglandin-mediated protection.
What to do
Avoid combining NSAIDs; use one agent at the lowest effective dose and shortest duration.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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References
Other interactions of Diflunisal
- Diflunisal + Ketorolac Contraindicated
- Diflunisal + Ketorolac intranasal Contraindicated
- Acemetacin + Diflunisal Major
- Acetazolamide + Diflunisal Major
- Alteplase + Diflunisal Major
- Amiloride + Diflunisal Major
Other interactions of Naproxen
- Ketorolac intranasal + Naproxen Contraindicated
- Ketorolac + Naproxen Contraindicated
- Aceclofenac + Naproxen Major
- Acemetacin + Naproxen Major
- Acetylsalicylic acid + Naproxen Major
- Alteplase + Naproxen Major
Frequently asked questions
Can I take Diflunisal with Naproxen?
MediHelp rates the interaction as major. Diflunisal and Naproxen can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Taking two NSAIDs together increases the risk of gastrointestinal ulcers and bleeding, kidney injury and cardiovascular events without added analgesic benefit.
How serious is the interaction between Diflunisal and Naproxen?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid combining NSAIDs; use one agent at the lowest effective dose and shortest duration.
What other medicines interact with Diflunisal?
MediHelp also lists interactions of Diflunisal with, for example, Ketorolac, Ketorolac intranasal, Acemetacin. The full list is on the Diflunisal page.
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