Open | Warfarin

Warfarin is a high-risk medicine. You can reduce harm from warfarin and measure its effectiveness with INR monitoring.

Check other medicines prescribed or purchased including alternative products.

• Document the target INR.
• Interactions can affect the INR and result in harm, for example:
• many antibiotics and antifungals
• some over-the-counter and alternative medicines
• alcohol
• green leafy vegetables.
• Check the patient’s understanding of INR monitoring.

For more information, see these online resources.

• High-risk medicines factsheet
• Warfarin factsheet
• Warfarin poster
• Patient story – John Smith
• Patient story – Gary Edwards