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Does Imatinib Mesylate Interact with Warfarin?

Imatinib Mesylate and Warfarin have a contraindicated drug interaction according to U.S. FDA drug labeling data. Warfarin should not be used in patients requiring anticoagulation; use low-molecular weight or standard heparin instead due to CYP2C9 and CYP3A4 metabolism. The mechanism involves warfarin metabolized by cyp2c9 and cyp3a4; imatinib inhibits cyp3a4. 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
Contraindicated
Management
Do not take together
Data Source
U.S. FDA via OpenFDA

How This Interaction Works

The interaction between Imatinib Mesylate and Warfarin occurs because warfarin metabolized by cyp2c9 and cyp3a4; imatinib inhibits cyp3a4. Clinically, this means warfarin should not be used in patients requiring anticoagulation; use low-molecular weight or standard heparin instead due to cyp2c9 and cyp3a4 metabolism. Because of the severity of this interaction, these medications are contraindicated — meaning they should not be taken together under any circumstances. If you are currently taking both, contact your healthcare provider immediately to discuss alternatives.

What To Tell Your Doctor or Pharmacist

If you are taking Imatinib Mesylate and your doctor is considering prescribing Warfarin (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 about alternative medications that do not interact with your current regimen
  • Ask how frequently you should be monitored while these are co-prescribed
  • Never stop or change either medication without first consulting your healthcare provider
💊 Imatinib Mesylate(Imatinib Mesylate)+💊 Warfarin(Warfarin Sodium)

Severity & Interaction Details

⛔
contraindicated
Avoid this combination
FDA labeling lists this pair as contraindicated. The risk outweighs the benefit in nearly all cases.
Severity scale
MinorContra
On record
Yes
Drug A class
—
Drug B class
—
Source
NLP:imatinib mesylate

What this means in plain English

Warfarin should not be used in patients requiring anticoagulation; use low-molecular weight or standard heparin instead due to CYP2C9 and CYP3A4 metabolism.

What the FDA label says

"Warfarin metabolized by CYP2C9 and CYP3A4; imatinib inhibits CYP3A4"

📖 Source: NLP:imatinib mesylate

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Data sourced from U.S. FDA drug labeling via openFDA and the NIH National Library of Medicine. For informational purposes only. Always consult your pharmacist or physician.