Calcium Channels

Calcium-Sensing Receptor Antagonists I is an antagonist of calcium-sensing parathyroid hormone receptors.

Etripamil (MSP-2017) is a short-acting L-type calcium-channel antagonist with a rapid onset of action designed for intranasal administration, used to treat Paroxysmal Supraventricular Tachycardia (PSVT). Etripamil (MSP-2017) slows atrioventricular nodal conduction and prolongs atrioventricular nodal refractory periods by inhibiting calcium ion influx through the calcium slow channels in the atrioventricular node cells.