Dopamine
Dopamine is a potent endogenous neurotransmitter used clinically as a vasopressor and inotrope, uniquely characterized by its dose-dependent effects on the cardiovascular system. At low doses, it acts on dopaminergic receptors to increase renal blood flow; at intermediate doses, it stimulates β1-receptors to boost cardiac contractility; and at high doses, it activates α1-receptors to cause potent vasoconstriction.
