<unk>  is pharmacologically active as an antiarrhythmic agent. It has electrophysiological effects of a class III antiarrhythmic drug and it is used as a medicine to increase the Q – T interval of the PQRST heart rhythm in patients with cardiac arrhythmias. The equivalent drug procainamide, which is a class Ia antiarrhythmic drug, is also used in patients with cardiac arrhythmias. Nevertheless, NAPA does only affect the Q - T interval, while procainamide has also effect on the QRS-interval. Also the electrophysiologic properties of NAPA are a little bit different from those of procainamide and NAPA is not completely effective for suppressing ventricular dysrhythmias, but its antiarrhythmic mechanisms are similar to those of procainamide.
Acecainide
Tocainide
Flecainide
Procainamide
Verapamil
Ibutilide
Dofetilide
Amiodarone