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1.
A classification of chemical compounds, most of which are psychoactive drugs. Beta-Phenethylamine is neurotransmitter in the brain, and it is believed to be the body's natural version of amphetamine.
Some drugs that fall into the phenethylamine classification include all amphetamines (as well as methylphenidate), ephedrine, designer hallucinogens (2C-B, 2C-I etc.), mescaline, bupropion (Wellbutrin), and venlafaxine (Effexor), as well as the amino acids (D/L)Phenylalanine and L-Tyrosine.

Many (if not all) hallucinogenic phenethylamines are mentioned in the book PiHKAL (Phenethylamines i Have Known And Loved) by Dr. Alexander Shulgin and Ann Shulgin.
Dan: How exactly does Wellbutrin work as an apetite supressant?
Paul: Well, technically Wellbutrin is a phenethylamine and an amphetamine, so it blocks the reuptake of dopamine to curve your apetite.
by Patrick Sibley May 11, 2007