Background:

Procainamide hydrochloride is an anti-arrhythmic agent and is used to treat cardiac arrhythmia; induces rapid block of the batrachotoxin(BTX)-activated sodium channels of the heart muscle and acts as antagonist to long gating closures.

参考文献:
[1]. Zamponi GW, et al. Dual actions of procainamide on batrachotoxin-activated sodium channels: open channel block and prevention of inactivation. Biophys J. 1993 Dec;65(6):2324-34.
[2]. http://en.wikipedia.org/wiki/Procainamid