Drug interactions
Phenindione + Tolmetin
Severity: Major
Phenindione and Tolmetin: major interaction.
Last updated
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
Phenindione is a vitamin K antagonist and tolmetin impairs platelet function and can cause gastrointestinal ulceration. The combination increases the risk of serious bleeding.
What this interaction means in plain words
Phenindione and Tolmetin 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 hemostatic impairment from anticoagulation and NSAID antiplatelet and mucosal effects, with possible protein-binding displacement.
What to do
Avoid concurrent use and choose a non-NSAID analgesic. If unavoidable, monitor INR and bleeding closely and consider gastroprotection.
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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Other interactions of Tolmetin
- Ketorolac intranasal + Tolmetin Contraindicated
- Ketorolac + Tolmetin Contraindicated
- Aceclofenac + Tolmetin Major
- Acemetacin + Tolmetin Major
- Alteplase + Tolmetin Major
- Amlodipine-hydrochlorothiazide-valsartan + Tolmetin Major
Frequently asked questions
Can I take Phenindione with Tolmetin?
MediHelp rates the interaction as major. Phenindione and Tolmetin 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. Phenindione is a vitamin K antagonist and tolmetin impairs platelet function and can cause gastrointestinal ulceration. The combination increases the risk of serious bleeding.
How serious is the interaction between Phenindione and Tolmetin?
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 concurrent use and choose a non-NSAID analgesic. If unavoidable, monitor INR and bleeding closely and consider gastroprotection.
What other medicines interact with Tolmetin?
MediHelp also lists interactions of Tolmetin with, for example, Ketorolac intranasal, Ketorolac, Aceclofenac. The full list is on the Tolmetin page.
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