A friend of mine has AF but is under no blood thinners. Maybe I can get away with this drug class.

All patients with AF do not have the same risk for adverse events from the arrhythmia. 

"My friend who is under no blood thinners probably has a low-risk, compared to the bleeding risk of such therapy. 

That is why he takes no relevant medication''. 

This is a wrong response that could lead to potentially harmful results to the health.