Drug interactions
Aspirin / citric acid / sodium bicarbonate + Diflunisal
Severity: Major
Aspirin / citric acid / sodium bicarbonate and Diflunisal: 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
The effervescent aspirin product delivers a full analgesic salicylate dose, so combining it with diflunisal raises the risk of GI bleeding and renal effects. The sodium load may also matter in hypertension or heart failure.
What this interaction means in plain words
Aspirin / citric acid / sodium bicarbonate and Diflunisal 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 COX inhibition with platelet dysfunction and mucosal injury.
What to do
Avoid combining two salicylate/NSAID analgesics. Use a single agent and monitor for GI bleeding if combined use 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 Aspirin / citric acid / sodium bicarbonate with Diflunisal?
MediHelp rates the interaction as major. Aspirin / citric acid / sodium bicarbonate and Diflunisal 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. The effervescent aspirin product delivers a full analgesic salicylate dose, so combining it with diflunisal raises the risk of GI bleeding and renal effects. The sodium load may also matter in hypertension or heart failure.
How serious is the interaction between Aspirin / citric acid / sodium bicarbonate and Diflunisal?
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 two salicylate/NSAID analgesics. Use a single agent and monitor for GI bleeding if combined use 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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