NCIt definition : The bitartrate salt form of phenylephrine, a direct-acting sympathomimetic amine chemically
related to adrenaline and ephedrine with potent vasoconstricting activity. Phenylephrine
is a post-synaptic alpha-adrenergic receptor agonist that causes vasoconstriction,
increases systolic/diastolic pressures, reflex bradycardia, and increases stroke output.;