FDA Says Zithromax Can Cause Fatal Irregular Heart Rhythm


pfizerThe U.S. Food and Drug Administration warned on Tuesday that the popular antibiotic azithromycin, sold as Zithromax, can cause a potentially fatal irregular heart rhythm in some patients.

The agency said the move follows its review of a study by medical researchers as well as a company study assessing the drug’s potential for causing abnormal changes in the electrical activity of the heart.

Last May, a study in the New England Journal of Medicine compared the risk of cardiovascular death in patients who took Zithromax with those who took several other antibiotics, including amoxicillin. It found that patients who took Zithromax, made by Pfizer Inc, had higher rates of fatal heart rhythms.

Generic versions of Zithromax are also available.

In its warning, the FDA said the drug can alter the electrical activity of the heart, which may lead to a potentially fatal heart rhythm known as prolonged QT interval, in which the timing of the heart’s contractions becomes irregular.

Read more at REUTERS

{Matzav.com Newscenter}


  1. Finally they find this out? Zithromax has been on the market in the USA, and prescribed by doctors since 1986! This reminds me that it took 7 years before the FDA warned us that the class of anti-depressants; SSRI’s were potentially very dangerous to adolescents. This same research was well known and publicized in Europe long before the FDA decided to “Black Box” it and list the dangers. Had it not been for the work of Focus Adolescent Services I wonder how many children on those medications may have suicided. We can thank them for saving the lives of countless adolescents and even perhaps support their work. Yes let’s do, send them a gift; I have followed their work for 20 years.


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