Eliquis can increase your international normalized ratio (INR).INR is used to describe the results of a lab test called prothrombin time (PT). PT monitors your blood’s ability to clot while you’re taking a different anticoagulant drug called warfarin (Jantoven). The dosage of warfarin is adjusted based on your INR.However, unlike warfarin, your Eliquis dosage doesn’t need to be adjusted based on your INR. Therefore, you won’t have your INR checked while you’re taking Eliquis. However, if you’re switching between Eliquis and warfarin, your doctor may measure your INR before you make the switch.If you’re switching from warfarin to Eliquis, your INR should be below 2.0. If you’re switching from Eliquis to warfarin, your doctor will determine the appropriate INR level for switching.