Norepinephrine (NE), also called noradrenaline (NA) or noradrenalin, is an organic chemical
in the catecholamine
family that functions in the brain
as a hormone
. The name "noradrenaline", derived from Latin roots meaning "at/alongside the kidneys", is more commonly used in the United Kingdom; in the United States, "norepinephrine", derived from Greek roots having that same meaning, is usually preferred.
"Norepinephrine" is also the international nonproprietary name
given to the drug
Regardless of which name is used for the substance itself, parts of the body that produce or are affected by it are referred to as noradrenergic.