FDA says Zithromax can cause fatal irregular heart rhythm

(Reuters) – The Food and Drug Administration warned on Tuesday that the antibiotic azithromycin, sold as Zithromax, can cause a potentially fatal irregular heart rhythm in some patients. A study in the New England Journal of Medicine last May compared the risk of cardiovascular death from different antibacterial drugs and found that the drug, which is made by Pfizer Inc and is also sold by generic drugmakers, had a higher rate of death. …