Current use of azithromycin (Zithromax/Zmax, Pfizer) was linked with a twofold increased risk of ventricular arrhythmia compared with no antibiotic use, but this risk disappeared when azithromycin use was compared with amoxicillin use, in a large European study. These findings from more than 14 million outpatients in five European countries who were part of the Arrhythmogenic Potential of Drugs (ARITMO) study.

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