Drug interactions
Diflunisal + Parecoxib
Severity: Major
Diflunisal and Parecoxib: 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
Using two NSAIDs together adds toxicity without added analgesic benefit. Gastrointestinal bleeding, renal impairment and hyperkalemia risks increase.
What this interaction means in plain words
Diflunisal and Parecoxib 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.
Why it happens
Additive cyclooxygenase inhibition causes cumulative mucosal, platelet and renal prostaglandin effects.
What to do
Avoid combining the two; use a single NSAID at the lowest effective dose. Monitor renal function if exposure is unavoidable.
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
Frequently asked questions
Can I take Diflunisal with Parecoxib?
MediHelp rates the interaction as major. Diflunisal and Parecoxib 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. Using two NSAIDs together adds toxicity without added analgesic benefit. Gastrointestinal bleeding, renal impairment and hyperkalemia risks increase.
How serious is the interaction between Diflunisal and Parecoxib?
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 the two; use a single NSAID at the lowest effective dose. Monitor renal function if exposure is unavoidable.
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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