Norfenefrine (INN; also known as meta-octopamine, 3-octopamine, and 3,β-dihydroxyphenethylamine) is an adrenergic agent used as a sympathomimetic drug which is marketed in Europe, Japan, and Mexico. Along with its structural isomer p-octopamine and the tyramines, norfenefrine is a naturally occurring, endogenous trace amine and plays a role as a minor neurotransmitter in the brain. Norfenefrine (INN; also known as meta-octopamine, 3-octopamine, and 3,β-dihydroxyphenethylamine) is an adrenergic agent used as a sympathomimetic drug which is marketed in Europe, Japan, and Mexico. Along with its structural isomer p-octopamine and the tyramines, norfenefrine is a naturally occurring, endogenous trace amine and plays a role as a minor neurotransmitter in the brain.