Milrinone Lactate is a positive inotropic cardiotonic compound. Milrinone Lactate has vasodilator properties, inhibiting cAMP phosphodiesterase type 3 activity in the myocardium and vascular smooth muscle.
RS-93522 is an antagonist of calcium channel. RS-93522 had the additional property of inhibiting phosphodiesterase activity in myocardial homogenates (IC50 = 1.6 x 10(-5)M), the potency and efficacy of phosphodiesterase inhibition was similar to that for