Pfizer Antibiotic Linked To Deadly Heart Disorder, FDA Warns

Law360, New York (March 12, 2013, 4:13 PM EDT) -- 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...
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