I Have Taking Pradaxa Since March, 2014. I Have Not

I have taking Pradaxa since March, 2014. I have not had another stroke, I would like to stop the medicine because it's dangerous. My cardio list told he would leave me on a short time. I have a heart implant to see if the doctor can discover why I had the stroke. I see him every 6 months. The next appointment is Monday, May 6,2015. Is it possible for another medi. to take its place, it's very expensive, I'm 71.