Table 2.

Blockers commonly used to investigate specific ion currents

Ion current	Blockers
Sodium current (I Na)	Flecainide, TTX
L-type calcium current (I CaL)	Nifedipine
T-type calcium current (I CaT)	Nickel
Late sodium current (I NaL)	GS967, ranolazine
Transient outward potassium current (I to1)	4-Aminopyridine
Rapid delayed rectifier potassium current (I Kr)	E-4031
Slow delayed rectifier potassium current (I Ks)	JNJ303, chromanol 293B
Inward rectifier potassium current (I K1)	Barium
“Funny” current (I f)	Ivabradine

TTX tetrodotoxin