I have been taking Warfarin for 11 weeks following a Pulmonary Embolism. My INR once in range was stable ( therapeutic range of 2.5-3.5), but it is dropping 2.0, 1.9 and now 1.8. My Warfarin has been increased, but I am finding this result quite strange. I am feeling well and the only thing different in my routine is that I am increasing my exercise. Is this variability in INR result common when taking Warfarin, and should I be concerned?.
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