Why did the FDA issue a safety communication about Zithromax?

On March 12, 2013, the FDA issued a safety communication to warn the public that Zithromax can cause abnormal changes to the normal electrical activity of the heart that may lead to potentially fatal irregular heart rhythms. They also updated the drug label to warn patients of the cardiovascular risks, such as prolonged QT intervals, associated with taking Zithromax.

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