Vesnarinone (INN) is a cardiotonic agent.[1]
A mixed phosphodiesterase 3 inhibitor and ion-channel modifier that has modest, dose-dependent, positive inotropic activity, but minimal negative chronotropic activity. Vesnarinone improves ventricular performance most in patients with the worst degree of heart failure.
^Cavusoglu E, Frishman WH, Klapholz M (June 1995). "Vesnarinone: a new inotropic agent for treating congestive heart failure". Journal of Cardiac Failure. 1 (3): 249–257. doi:10.1016/1071-9164(95)90030-6. PMID9420657.