Dobutamine
Dobutamine is a beta adrenergic agonist. It acts on both beta-1 and beta-2 adrenergic receptors. Dobutamine increases myocardial contractility by stimulating beta-1 adrenergic receptors in the heart, and causes vasodilation by stimulating beta-2 adrenergic receptors in blood vessels, complemented by reflex vasoconstriction to the increase cardiac output.