Moxifloxacin prolongs QT interval duration. The amplitude of this effect is small, and the risk of moxifloxacin-induced torsades de pointes is expected to be minimal when the drug is administered at the recommended dose of 400 mg/d. However, moxifloxacin should not be used in patients with predisposing factors of torsades de pointes such as electrolyte disturbances and bradycardia or during coadministration of proarrhythmic drugs.
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