What does that mean for you?
If you have an existing heart condition, be aware and talk to your doctor about your options if you need an antibiotic. Other macrolide antibiotics (clarithromycin, erythromycin) and quinolone antibiotics (Cipro, Levaquin) have the same potential side effect, but there are other options out there and your doctor will best be able to weigh your risk against your need for a particular medication.
Still, the Z-Pak is so commonly prescribed because it is effective, and not everyone is at risk—scary as the chance of an abnormal heart rhythm sounds. The recommendation from the FDA? Always a good idea for any medicine, especially antibiotics: don’t stop taking it without talking to your doctor.
You can find more information in the complete FDA Safety Announcement.