Can you get blood clots while taking warfarin for 3 years?

Occasionally, new blood clots (DVT or PE) develop in spite of a patient being on warfarin (Coumadin, Jantoven). ... care professional to have an old Doppler ultrasound for comparison, so that one can hopefully tell whether clot seen on the ultrasound is new since the previous study, or was already present. read more

Taking too little of these medications may not be effective, and taking too much can lead to serious bleeding. Also, blood thinners may not be able to lessen the strong blood-clotting tendency of an underlying disease, such as cancer. Interactions with other medications, food and alcohol are common with warfarin. These interactions are less so with other blood-thinning medications. read more

While it can be found in patients with lupus (a rheumatologic disease), it can also be present in other patients with blood clots. The presence of a lupus anticoagulant can lead to inaccurate INR values: An INR may look like it is satisfactory (for example a value of 2.8), but in the patient with a lupus anticoagulant that INR value may actually not indicate adequate blood thinning. read more