Does Warfarin Interact with Ranitidine?
Warfarin and Ranitidine have a moderate drug interaction according to U.S. FDA drug labeling data. Reports of altered prothrombin time during concurrent ranitidine and warfarin therapy. Close monitoring of prothrombin time is recommended due to warfarin's narrow therapeutic index. 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
- Ranitidine Class
- Histamine-2 Receptor Antagonist
- Management
- Monitor for effects
- Data Source
- U.S. FDA via OpenFDA
What To Tell Your Doctor or Pharmacist
If you are taking Warfarin and your doctor is considering prescribing Ranitidine (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