Norepinephrine, also known as noradrenaline, is a neurotransmitter and a hormone that plays a crucial role in the sympathetic nervous system’s “fight or flight” response. It belongs to a class of compounds known as catecholamines and is closely related to another neurotransmitter, epinephrine (adrenaline). Chemical name: “4-[(1R)-2-amino-1-hydroxyethyl]benzene-1,2-diol.” Uses 1. Hemodynamic …