You had me searching..
Anyhoo, Tikosyn) dofetelide is in the same class of antiarrythmics as sotalol...Vaugn Williams Class 3 (gee, the singer or the composer
) via Potassium channel blockade and prolonged repolarization.
Others in this class are Ibutilide, amiodarone, and bretylium.
The Vaugn Williams classification is by effect only and thus drugs are not necessarily similar, only the effects. People might do far better on one or the other.
Now I know why sotalol is uniquely effective among the beta-blockers for A-fib.
Here's a nice categorization of the various classes of antiarrhythmics from the University of Utah:
Class I Sodium Channel Blockade
** Class IA
Quinidine, procainamide, disopyramide
Lidocaine, mexiletine, tocainide, phenytoin
Little effect on repolarization
Encainide, flecainide, propafenone, moricizine(?)
Class II Beta-Adrenergic Blockade
Propanolol, esmolol, acebutolol, l-sotalol
Prolong Repolarization (Potassium Channel Blockade; Other
Ibutilide, dofetilide, sotalol (d,l), amiodarone, bretylium
Class IV Calcium Channel Blockade
Verapamil, diltiazem, bepridil
Adenosine, digitalis, magnesium