MINNEAPOLIS (WCCO) — There’s new warning about a popular antibiotic you might have taken.

The Food and Drug administration says azithromycin, known as the Z-Pak, can cause a potentially deadly heart problem.

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They say the drug could cause an irregular heart rhythm that could be especially dangerous for patients who’ve had a prior heart attack, angina or chest pain.

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The antibiotic is used to treat many kinds of infections including pneumonia and tonsillitis.

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The FDA says doctors should be aware of the risk factors before prescribing the Z-Pak to patients.