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Ethacizine hydrochloride (Ethacizin; NIK-244) is a longer-lasting Class Ic antiarrhythmic agent than?Flecainide[1]. Ethacizine hydrochloride (Ethacizin; NIK-244) inhibits the depolarizing current responsible for the intraatrial and His-Purkinje-ventricular conduction[2].

[1] Sugiyama A, et al. Comparison of cardiovascular effects of a novel class Ic antiarrhythmic agent, NIK-244, with those of flecainide in isolated canine heart preparations cross-circulated with a donor dog.Jpn J Pharmacol. 1991 May;56(1):1-12. DOI:10.1254/jjp.56.1
[2] Satoh H, et al. An electrophysiological comparison of a novel class Ic antiarrhythmic agent, NIK-244 (ethacizin) and flecainide in canine ventricular muscle.Br J Pharmacol. 1989 Nov;98(3):827-32.Med Chem.?2019 Nov 6:115132. DOI:10.1111/j.1476-5381.1989.tb14611.x