NCIt definition : An alpha- and beta-adrenergic receptor agonist with sympathomimetic activity. Phenylpropanolamine
(PPA) binds to and activates alpha- and beta-adrenergic receptors in the mucosa of
the respiratory tract resulting in vasoconstriction and reduction in swelling of nasal
mucous membranes and reduction in tissue hyperemia, edema, and nasal congestion. This
agent also stimulates the release of norepinephrine from its storage sites resulting
in the effects already described. Finally, PPA indirectly stimulates beta-receptors
producing tachycardia and a positive inotropic effect.;