Symbicort Inhaler ?

Went to allergist and recommended symbicort Inhaler . Quite frankly I am apprehensive as it not only has a steroid but a bronchodilator. Any thoughts concerning it causing a fib. I have paroxysmal a fib. Any suggestions will be greatly appreciate . Just recently had an episode of a fib and I definitely don’t wAnt to have another one so soon. Thank you .