Z-Pack antibiotics are a five-day course of azithromycin that were prescribed very frequently. Why did they fall out of favor with doctors? Skip to main content. Open Navigation Menu ...

Pfizer, the maker of Z-Pak, said it has already updated its drug labels to include heart rhythm risk. But patients are advised to remember that azithromycin is a very effective antibiotic, ...

Z-Pak May Increase Health Risks in Some Patients Dallas doctor who takes drug says he wants to see more information on study By Ellen Goldberg • Published May 16, 2012 • Updated on June 8 ...