Hi, thanks for using healthcare magic
Treatment of atrial fibrillation
involves controlling the heart rate, heart rhythm and preventing blood clots.The use of medication depends on many factors such as the degree of symptoms, the presence of other illness, the likelihood of cardioversion
( going to a normal heart rate and rhythm).
Your father will likely be on medication controlling the heart rate such as beta blockers, calcium channel blockers which are normally used first line.
He may also be on medication to reduce the chances of a heart attack
It would also be important to control any other risk factors such as high blood pressure
, diabetes ,high cholesterol
I hope this helps