I was diagnosed with Atrial Fibrilation in October. I have been taking Metroprolol and Propafenone since and has worked fairly well until about a week ago. My palpitations are back even with meds. Can you body get used to meds and stop working or could something be interfering? I did have a steroid shot 10 days ago for a sinus infection. Would that interfere with meds?

Summarized question: Will steroid shot interfere with medicines for Atrial Fibrilation?