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Therapeutic use and major side effects of sotalol

Elsa-Grace Giardina, MD, MS, FACC, FACP, FAHA
Section Editors
Mark S Link, MD
Hugh Calkins, MD
Deputy Editor
Brian C Downey, MD, FACC


Sotalol, a methanesulfonanilide, is a class III antiarrhythmic drug (table 1) that is used for the treatment of both atrial and ventricular arrhythmias.

This topic will review the electrophysiology and mechanisms of action of sotalol, and will discuss dosing, the different settings in which sotalol has been used as an antiarrhythmic drug, and major side effects. Recommendations for the role of sotalol in the treatment of atrial and ventricular arrhythmias are presented separately. (See "Antiarrhythmic drugs to maintain sinus rhythm in patients with atrial fibrillation: Recommendations" and "Pharmacologic therapy in survivors of sudden cardiac arrest", section on 'Choice of pharmacologic therapy'.)


Sotalol consists of a racemic mixture of d and l isomers in an approximate ratio of 1:1; this mixture is often called dl-sotalol. The two isomers contribute to the unique antiarrhythmic properties of sotalol [1-4]:

The d isomer prolongs repolarization by blocking IKr, the rapid component of the delayed rectifier potassium current that is responsible for phase 3 repolarization of the action potential (figure 1) [5,6]. This represents a class III effect. (See "Myocardial action potential and action of antiarrhythmic drugs".)

The l isomer has two actions: it prolongs repolarization and it has beta blocking activity. The latter effect is dose-dependent, is not cardioselective, and is not associated with membrane stabilizing activity or intrinsic sympathomimetic activity.


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Literature review current through: Sep 2016. | This topic last updated: Aug 26, 2015.
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