ATC Group: C08DA Phenylalkylamine derivatives

Etripamil is an L-type calcium influx inhibitor (slow channel blocker or calcium ion antagonist). Etripamil exerts its pharmacologic effect by modulating the influx of ionic calcium across the cell membrane of the AV nodal cells as well as arterial smooth muscles and contractile myocardial cells. By interrupting reentry at the AV node, etripamil can restore sinus rhythm in patients with PSVT.

Verapamil inhibits the transmembrane influx of calcium ions into the heart and vascular smooth muscle cell. The myocardial oxygen demand is lowered directly as a result of the effect on the energy consuming metabolic processes of the myocardial cell and indirectly due to a reduction of the afterload. Due to its effect on coronary vascular smooth muscle, verapamil enhances myocardial blood flow, even in post‐stenotic areas, and relieves coronary spasms. These properties contribute to the anti‐ischaemic and antianginal efficacy of verapamil in all types of coronary artery disease.