How do we know that this med is effective or not? I am aware that I have a malabsorption problem secondary to a gastric bypass almost 20 years ago, and my warfarin INRs were wildly labile. I also would bruise very easily on warfarin. Have been on Pradaxa a little over a month and have noticed no adverse effects and no bruising. I do have more abdominal gas, but I'm also a little over a month postop after partial colectomy which can also affect bowel gas. What baseline tests should I ask my cardiologist to perform?