Sotalol is a type III antiarrhythmic (K+ channel-blocking) that also has beta-blocker activity (Type II antiarrhythmic). This explains the decreased heartrate and blood pressure (beta-1 blocking activity), with the QT prolongation - all type III AADs cause QT prolongation.
-Adenosine decreases AV node conduction used in SVT, and its side effects include flushing, hypotension, chest pain, impending doom.
-Flecainide is a Sodium channel blocker Class 1C with strong Na channel blockage and its contraindicated in structural and ischemic heart disease.
-Phenytoin is an anti epileptic, associated with teratogenicity, p450 induction, osteopenia