Bradycardic syncope in 2 patients who recently began gatifloxacin treatment.

Gatifloxacin is a synthetic broad-spectrum 8-methoxyfluoroquinolone approved by the United States Food and Drug Administration in December 1999. Few side effects of this new antibiotic have been reported, and there are no previous case reports of bradyarrhythmias. We report 2 cases of syncope due to bradycardia in patients who recently began treatment with gatifloxacin.