NCIt definition : The hydrochloride salt form of moricizine, a phenothiazine analog with class I antiarrhythmic
activity. Moricizine hydrochloride blocks the rapid flow of sodium ions into the myocardial
cell during phase 0 of the action potential. This decreases excitability, slows the
impulse conduction through the atrioventricular (AV) node and depresses depolarization.;