Hi I have been on clarithromycin for about two weeks for a sinus infection. I have been noticing a flutter in my chest, like my heart is skipping a beat. I ve been ignoring it, b/c I can allow stress to impact me negatively. Guess I ve noticed this symptom on and off for a week or so. I continue to work out, notice nothing odd in my viceroys cardio. While resting my heart rate is up a noticeable amount. I ve decided to stop taking this JUST NOW b/c the skipping heart beat was worrying me. I really think this is from the medication, but how many days for side effects to subside? As in, if I notice NO heart Fluttering one day, two days, a week to go away if this is on fact the cause?