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Does Azathioprine Interact with Warfarin?

Azathioprine and Warfarin have a moderate drug interaction according to U.S. FDA drug labeling data. Azathioprine may inhibit the anticoagulant effect of warfarin. 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
Moderate
Azathioprine Class
Purine Antimetabolite
Management
Monitor for effects
Data Source
U.S. FDA via OpenFDA

What To Tell Your Doctor or Pharmacist

If you are taking Azathioprine 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 whether any dosage adjustments are needed
  • Never stop or change either medication without first consulting your healthcare provider
💊 Azathioprine(Imuran)+💊 Warfarin(Warfarin Sodium)

Severity & Interaction Details

🟡
moderate
Be aware — moderate interaction
Documented interaction with manageable risk. May require dose adjustment or monitoring.
Severity scale
MinorContra
On record
Yes
Drug A class
Purine Antimetabolite
Drug B class
—
Source
NLP:azathioprine

What this means in plain English

Azathioprine may inhibit the anticoagulant effect of warfarin.

About Azathioprine and Warfarin

Azathioprine is a Purine Antimetabolite. Azathioprine is also sold under the brand name Imuran. Both medications are taken by mouth. Both Azathioprine and Warfarin carry an FDA boxed warning — the agency's most serious safety designation.

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Data integrity: Every interaction shown is extracted directly from official U.S. FDA drug labeling via openFDA and the U.S. National Library of Medicine (NIH) — no interactions are invented, inferred, or manually edited. Maintained by CheckDrugInteractions.com. See our methodology or report a correction at support@checkdruginteractions.com.

Data sourced from U.S. FDA drug labeling via openFDA and the NIH National Library of Medicine, supplemented with a small number of well-established interactions from curated clinical references. For informational purposes only. Always consult your pharmacist or physician.