Drug interactions
Ibritumomab tiuxetan + Warfarin
Severity: Major
Ibritumomab tiuxetan and Warfarin: 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
Ibritumomab tiuxetan can cause prolonged severe thrombocytopenia, which increases bleeding risk. Warfarin adds to this risk through its anticoagulant effect.
What this interaction means in plain words
Ibritumomab tiuxetan and Warfarin 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 bleeding risk from radioimmunotherapy-induced thrombocytopenia plus anticoagulation.
What to do
Monitor platelet counts and INR frequently, and avoid or interrupt warfarin when platelets are low unless the indication is compelling.
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 Warfarin
- Defibrotide + Warfarin Contraindicated
- Ketorolac + Warfarin Contraindicated
- Abciximab + Warfarin Major
- Acetylsalicylic acid + Warfarin Major
- Adagrasib + Warfarin Major
- Amiodarone + Warfarin Major
Frequently asked questions
Can I take Ibritumomab tiuxetan with Warfarin?
MediHelp rates the interaction as major. Ibritumomab tiuxetan and Warfarin 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. Ibritumomab tiuxetan can cause prolonged severe thrombocytopenia, which increases bleeding risk. Warfarin adds to this risk through its anticoagulant effect.
How serious is the interaction between Ibritumomab tiuxetan and Warfarin?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor platelet counts and INR frequently, and avoid or interrupt warfarin when platelets are low unless the indication is compelling.
What other medicines interact with Warfarin?
MediHelp also lists interactions of Warfarin with, for example, Defibrotide, Ketorolac, Abciximab. The full list is on the Warfarin page.
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