NCIt definition : A phenethylamine and a diastereomer of ephedrine with sympathomimetic property. Pseudoephedrine
displaces norepinephrine from storage vesicles in presynaptic neurones, thereby releasing
norepinephrine into the neuronal synapses where it stimulates primarily alpha-adrenergic
receptors. It also has weak direct agonist activity at alpha- and beta- adrenergic
receptors. Receptor stimulation results in vasoconstriction and decreases nasal and
sinus congestion.;