or dental procedure. pradaxa can cause serious, sometimes fatal, bleeding. don't take pradaxa if you have abnormal bleeding or have had a heart valve replaced. seek immediate medical care for unexpected signs of bleeding, like unusual bruising. pradaxa may increase your bleeding risk if you're 75 or older, have a bleeding condition or stomach ulcer, take aspirin, nsaids, or blood thinners... ...or if you have kidney problems, especially if you take certain medicines. tell your doctors about all medicines you take. pradaxa side effects include indigestion, stomach pain, upset, or burning. if you or someone you love has afib not caused by a heart valve problem... ...ask your doctor about reducing the risk of stroke with pradaxa.