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Norepinephrine (INN) (abbreviated norepi or NE) also called noradrenaline (BAN) (abbreviated NA NAd or norad) or 45-β-trihydroxy phenethylamine is a catecholamine with multiple roles including those as a hormone and a neurotransmitter. It is the hormone and neurotransmitter most responsible for vigilant concentration in contrast to its most chemically similar hormone dopamine which is most responsible for cognitive alertness.Medically it is used in those with severe hypotension.