HEALTH TOPICS 
Ask the doctor: Is the alternative to warfarin safe and effective?
Q. My wife's medication to treat atrial fibrillation recently was changed from warfarin to a new drug called Pradaxa. They say that the new medicine does not require regular INR tests and is just as effective. Is that so?
A. Yes, it is so. Before I explain why, let me provide a little background.
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