Epinephrine [Chemical/Ingredient] Norepinephrine [Chemical/Ingredient] C25204 Levonorepinephrine Precursor of epinephrine that is secreted by the adrenal medulla and is a widespread central and autonomic neurotransmitter. Norepinephrine is the principal transmitter of most postganglionic sympathetic fibers and of the diffuse projection system in the brain arising from the locus ceruleus. It is also found in plants and is used pharmacologically as a sympathomimetic. M0014964 N0000007426 Norepinephrine Levarterenol 1,2-Benzenediol, 4-(2-amino-1-hydroxyethyl)-, (R)- Norepinephrine Noradrenaline D009638 7512 C0028351 Norepinephrine