Norepinephrine is a naturally occurring chemical in the body that acts as both a hormone and neurotransmitter (a substance that sends signals between nerve cells), according to the Endocrine Society. As a hormone, norepinephrine (also called noradrenaline) is released by your adrenal glands, which sit atop your kidneys, says Cleveland Clinic. As a neurotransmitter, norepinephrine is derived… Continue reading What Is Norepinephrine? How It Affects the Body and How It's Used in Medication