Medchemexpress, HY-17611 5mg Etripamil CAS:1593673-23-4 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 [1] [2] . Purity:>98% Medchemexpress has over 10000 novel life-science reagents, reference compounds, APIs and natural compounds for laboratory and scientific use. Other quantity can also be offered.