My INR was just 2.1 today (target of 3 - I need to be at least 3 to feel well). I felt awful - slurring, calf felt achey again and I just couldn't think straight. I was dozing as I ate my toast - I was exhausted. However my B12 was also due today. Anyways warfarin dose increased by dr and I decided to use one of the clexanes I have at home for when INR low and I am symptomatic. Well that jab was just an hour or so ago and though I still feel a bit wobbly I can really tell a difference. Can clexane work this quickly or is it sheer optimism (and desperation - lol) from me?