inotropic drugs with different mechanisms of action , such as digitalis glycosides , ephedrine , dopamine , dobutamine , ibopamine , terbutaline , salbutamol , pirbuterol , prenalterol , amrinone , and milrinone , have been tested in combination with vasodilators with a predominant effect on preload ( nitrates , molsidomine ) , with a predominant effect on afterload ( hydralazine , nifedipine ) , or with a balanced action on both arterial and venous beds ( nitroprusside , prazosin , captopril ) , showing positive results .
C0002697
amrinone
C0128513
milrinone