Your Side Effects May IncludeAzithromycin (Zithromax) side effects
This side effect is printed on the FDA label for Azithromycin. It was a question in our daily quiz, where you pick the real side effect from four choices.
A dangerous change in heart rhythm
The Z-Pak is one of the most common antibiotics. Older adults and people with low potassium are at higher risk.
“There have been reports of QT prolongation and torsades de pointes .”
Tell your doctor about heart problems or low potassium. Get help right away for a fast or pounding heartbeat or fainting.
700 reports to the FDA's adverse event system mention a dangerous heart rhythm. A report is not proof the drug caused it. See the query
From quiz No. 19 · October 13, 2026 · Play that quiz →
More from the drug guide
Drug guide · Learn · About · Privacy · Terms · Contact
Not medical advice. Don't stop or start a medication because of a quiz. Talk to your doctor or pharmacist. Label text and report counts from openFDA. Not affiliated with any drug maker.