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Why INR keep dropping even after taking more Warfarin ?

Asking on behalf of my dad, he is 60, underwent bypass surgery a year ago, has been taking warfarin 10 years back. Recently his INR keep dropping even after taking more Warfarin, we went back to the doctor , after running all the test and scan, the doctor can t tell what is the problem, but advice him to take more warfarin, this time with 6mg for 2 days. Could there be underlying disease that has been missed? For example virus infection or cancer? What could be the most common cause? INR Reading Oct30 2.77 (Warfarin=3MG) Jan27 1.03 (Warfarin=3.5MG) Feb16 1.48 (Warfarin=4MG) Mar02 1.16 (Warfarin=4.5MG)
Asked On : Sat, 12 Mar 2011
Answers:  1 Views:  612
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Pediatrician, Pulmonology 's  Response
Its probably related to diet and other medicines he maybe taking along with warfarin which might interfere with its metabolism.
recheck and question your doctor about drug interactions
Answered: Fri, 5 Aug 2011
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