Amiodarone hydrochloride (Amiodarone HCl) is an antianginal and class III antiarrhythmic drug. It increases the duration of ventricular and atrial muscle action by inhibiting POTASSIUM CHANNELS and VOLTAGE-GATED SODIUM CHANNELS. There is a resulting decrease in heart rate and in vascular resistance.

KTX-Sp2, a potassium channel toxin, effectively blocks exogenous voltage-gated potassium channels Kv1.1, Kv1.2, and Kv1.3, as well inhibits the endogenous Kv1.3 channel and suppresses Ca2+ signaling in Jurkat T cells. Additionally, KTX-Sp2 inhibits IL-2 secretion from activated Jurkat T cells [1].

PD-118057 is a potent ether associated (hERG) potassium channel activator that shows no activity against hERG. PD-118057 inhibits the excitability of the membrane by activating the hERG channel. PD-118057 is a potential compound for the treatment of delayed repolarization in inherited or acquired long QT syndrome and congestive heart failure.

Taurocholic acid sodium salt hydrate (Sodium taurocholate hydrate) is the product of conjugation of taurine with cholic acid. The sodium salt, the main ingredient of the bile of carnivorous animals, is used as a detergent to solubilize fats for absorption. It is used as a cholagogue and cholerectic.

Almokalant is a class III antiarrhythmic drug, acts as a potassium channel blocker. And it inhibits a specific component (Ikr) of the time-dependent delayed rectifier K+ current.