Verapamil-d3 (hydrochloride) is the deuterium labeled Verapamil hydrochloride. Verapamil hydrochloride (()-Verapamil hydrochloride) is a calcium channel blocker and a potent and orally active first-generation P-glycoprotein (P-gp) inhibitor. Verapamil hydrochloride also inhibits CYP3A4. Verapamil hydrochloride has the potential for high blood pressure, heart arrhythmias and angina research[1][2][3].