Three days after completing her treatment with azithromycin, her INR had increased to 4.88 without evidence of bleeding. The warfarin was discontinued, and her INR returned to normal four days later.

Warfarin, a vitamin K antagonist ... our inpatient anticoagulation service clinical pharmacist and the therapeutic drug monitoring laboratory personnel, we eliminated this possibility, since ...

Currently, anticoagulation with warfarin is generally prescribed and ... spent less time in the international normalized ratio [INR] target range) and a much higher risk of excessive ...

To get the correct warfarin dose, patients have to have their INR tested. INR—international normalized ratio test—is a common blood test that determines how quickly your blood clots.