The drug touted to replace warfarin is NOT interchangeable in some instances. For instance any patient with heart valve transplants and perhaps other surgery as well. The new drug is NOT prescribed....the old reliable warfarin is the one docs choose. Inconvenient when eating...watch your diet! and frequent blood tests for INR. This information from a doctor when asked why not the new drug rather than the old?
As DJT would say, ‘Believe me! Believe Me!’
You make a good point about certain situations ruling out the newer medications.