Description_x000D_ Application_x000D_ Aprindine hydrochloride is a class Ib antiarrhythmic and hERG channel blocker. Aprindine hydrochloride also inhibits the activities of calmodulin-sitmulated cyclic 3′:5′-nucleotide phosphodiesterase and Ca-ATPase._x000D_ Packaging_x000D_ 10, 50 mg in glass bottle_x000D_ Biochem/physiol Actions_x000D_ Aprindine hydrochloride is a class Ib antiarrhythmic and hERG channel blocker. Aprindine shows structure similarities to lidocaine and procainamide and is effective in treatment of patients with ventricular premature depolarizations, ventricular tachycardia, and supraventricular arrhythmias. Aprindine inhibits the activation of bovine brain cyclic 3′:5′-nucleotide phosphodiesterase (EC 3.1.4.17) by calmodulin and inhibits calmodulin-stimulated Ca-ATPase (ATP phosphohydrolase EC 3.6.1.3) activity._x000D_ Features and Benefits_x000D_ This compound is also offered as part of Sigma′s Library of Pharmacologically Active Compounds (LOPAC®1280), a biologically annotated collection of high-quality, ready-to-screen compounds. Click here to learn more._x000D_ This compound is featured on the Potassium Channels page of the Handbook of Receptor Classification and Signal Transduction. To browse other handbook pages, click here._x000D_ Legal Information_x000D_ LOPAC is a registered trademark of Sigma-Aldrich Co. LLC