Doctors may prescribe azithromycin, or Z-Pack, to treat strep throat in people allergic to penicillin or other first-line antibiotics. Side effects may include nausea, headaches, and diarrhea. Strep ...

It's typically given for infections such as strep throat, bronchitis, and sinus infections. But the antibiotic can interfere with the heart's electrical activity, disturbing its rhythm with ...