• Pfizer Antibiotic Zithromax (Azithromycin) Linked To Deadly Heart Disorder
  • March 18, 2013
  • Law Firm: Lieff Cabraser Heimann Bernstein LLP - San Francisco Office
  • As reported by Law360, the U.S. Food and Drug Administration warned Tuesday that use of the popular antibiotic azithromycin, sold by Pfizer Inc. as Zithromax, can cause a potentially fatal irregular heart rhythm, saying it had strengthened the warning on the drug's labeling.

    Azithromycin users with certain heart conditions are at greater risk of developing an irregular heart rhythm, the FDA said. The conditions include a prolonged QT interval, a measurement of the heart's electrical cycle; a slow heart rate; and low potassium and magnesium levels in the blood. Users of some of the drugs that treat irregular heart rhythms are also at greater risk of developing the condition while on azithromycin, according to the agency.

    The FDA added information about the risks of irregular heart rhythms to the labeling on azithromycin. It told physicians to consider the risks when deciding whether to prescribe azithromycin to patients with certain heart conditions.