Does Diflunisal Interact with Acetylsalicylic Acid?
Diflunisal and Acetylsalicylic Acid have a moderate drug interaction according to U.S. FDA drug labeling data. Concomitant administration is not generally recommended due to potential for increased adverse effects. Aspirin reduces diflunisal protein binding and may decrease diflunisal levels. The mechanism involves reduced protein binding; decreased diflunisal levels. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This information is based on official FDA drug labeling sourced from OpenFDA and the NIH National Library of Medicine.
- Severity
- Moderate
- Diflunisal Class
- Nonsteroidal Anti-inflammatory Drug
- Management
- Monitor for effects
- Data Source
- U.S. FDA via OpenFDA
How This Interaction Works
The interaction between Diflunisal and Acetylsalicylic Acid occurs because reduced protein binding; decreased diflunisal levels. Clinically, this means concomitant administration is not generally recommended due to potential for increased adverse effects. aspirin reduces diflunisal protein binding and may decrease diflunisal levels. This is classified as a moderate interaction. While it may not require stopping either medication, your healthcare provider should be aware you are taking both so they can monitor for potential effects and adjust treatment if necessary.
What To Tell Your Doctor or Pharmacist
If you are taking Diflunisal and your doctor is considering prescribing Acetylsalicylic Acid (or vice versa), make sure to:
- Inform your doctor and pharmacist of all current medications, including over-the-counter drugs and supplements
- Ask whether the benefits of combining these medications outweigh the risks for your specific situation
- Ask what symptoms to watch for that would indicate the interaction is causing problems
- Ask whether any dosage adjustments are needed
- Never stop or change either medication without first consulting your healthcare provider