Drug interactions
Diclofenac + Parecoxib
Severity: Major
Diclofenac 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
Parecoxib is converted to valdecoxib, a COX-2 inhibiting NSAID, so combining it with diclofenac duplicates therapy. This raises the risk of gastrointestinal, renal and cardiovascular adverse effects without added benefit.
What this interaction means in plain words
Diclofenac 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
Duplicate cyclooxygenase inhibition with additive effects on gastric, renal and cardiovascular prostaglandin pathways.
What to do
Avoid combining the two; use a single NSAID 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 Diclofenac
- Diclofenac + Ketorolac Contraindicated
- Diclofenac + Ketorolac intranasal Contraindicated
- Aceclofenac + Diclofenac Major
- Acemetacin + Diclofenac Major
- Alteplase + Diclofenac Major
- Amiloride + Diclofenac Major
Frequently asked questions
Can I take Diclofenac with Parecoxib?
MediHelp rates the interaction as major. Diclofenac 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. Parecoxib is converted to valdecoxib, a COX-2 inhibiting NSAID, so combining it with diclofenac duplicates therapy. This raises the risk of gastrointestinal, renal and cardiovascular adverse effects without added benefit.
How serious is the interaction between Diclofenac 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 and shortest duration.
What other medicines interact with Diclofenac?
MediHelp also lists interactions of Diclofenac with, for example, Ketorolac, Ketorolac intranasal, Aceclofenac. The full list is on the Diclofenac page.
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