Hi Will, I don't know how you will react to them but during the spells when I have needed to take them my INR was very unpredictable. I have come to the conclusion, that for me at least, the underlying problem creating the need for antacids is as much or more to blame than the medications themselves. Try to space your coumadin and antacids as far apart as possible. I think when I took them too close together it might have affected how well the warfarin was absorbed or something because I ended up having to increase my dosage. I'm currently taking Prevacid and have had to increase my coumadin again. My INR really dropped and I was put on Lovenox for several days before it finally got above 2.0.
You may react differently but I think you will need to watch it to see what happens.