Nemazoline (A-57219) is selective α-adrenergic agent with α1-agonist/α2-antagonist activity, which is used as a nasal decongestant. Nemazoline produces decongestion by α1-mediated contraction of capacitance vessels, but not compromises blood flow by virtue of α2-antagonism. Nemazoline also blocks endogenous noradrenaline-mediated α 2-constriction of the resistance vessels[1].