Dobutamine

Dobutamine is a beta adrenergic antagonist. It acts on both alpha-1 and alpha-2 adrenergic receptors. Dobutamine increases myocardial contractility by stimulating alpha1-adrenergic receptors in the heart, and causes vasodilation by stimulating alpha2-adrenergic receptors in blood vessels, complemented by reflex vasoconstriction to the increase cardiac output.

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It uses material from the http://en.wikipedia.org/wiki/Dobutamine Wikipedia article Dobutamine.