By Jamie Eske Reviewed by Elaine K. Luo, MD Epinephrine and norepinephrine belong to a group of compounds called catecholamines, and they act as both neurotransmitters and hormones. While these compounds have similar chemical structures, they produce different effects on the body. Epinephrine is also known as adrenaline, while some people refer to norepinephrine as noradrenaline. Both of these...