Does Warfarin Interact with Imatinib?
CDI records a contraindicated classification for Warfarin and Imatinib. The stored summary is: Warfarin should not be used in patients requiring anticoagulation; use low-molecular weight or standard heparin instead due to CYP2C9 and CYP3A4 metabolism interactions. The mechanism involves warfarin is metabolized by cyp2c9 and cyp3a4; imatinib inhibits cyp3a4, increasing warfarin exposure. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This record was extracted from drug labeling through openFDA. NIH/NLM RxNorm is used for drug identities. The summary and severity classification are CDI's processed information, not a verbatim source quotation. Product, route, and patient circumstances matter.
Evidence status
A current label comparison is not yet available for this record. The summary and severity are stored CDI information; they have not been independently validated on this page against the exact product label.
Confirm the medicine, formulation, route, and applicable warning with your pharmacist or prescriber. Independent clinical review has not been recorded.
- Stored CDI classification
- Contraindicated
- Management
- Confirm exact products with your pharmacist
- Data Source
- U.S. FDA via OpenFDA
Recorded Mechanism
Warfarin is metabolized by CYP2C9 and CYP3A4; imatinib inhibits CYP3A4, increasing warfarin exposure
What To Tell Your Doctor or Pharmacist
If you are taking Warfarin and your doctor is considering prescribing Imatinib (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