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The phényléthylamines are monoaminés Alcaloïde S. In the Brain, they play the part of Neurotransmetteur S. In nature, the phényléthylamines are synthesized starting from Phénylalanine, an Amino-acid . One also finds them such as they are in food having undergone a fermentation, like the Fromage for example. In fact colorless liquids form a salt with the Carbon dioxide (CO₂) in contact with the air. The phényléthylamines of food origin could have psychoactive effects, but their fast catabolism by the Enzyme MAO-B prevents high concentrations.

The phényléthylémines substituted consituent a branch and various classes of made up which can be Alcaloïde S, Hormone S, Neurotransmetteur S, various Stimulant S, products Hallucinogène S, entactogenes, Anorexigène S, Bronchodilatateur S or Antidépresseur S.

The structure of the phényléthylamines can be found in the LSD and some Morphine S.

The substituted phényléthylamines modify the ring phényl and the amino group:

the Amphétamines are phényléthylamines which carry a group alpha-methyl (α-CH₃);
the Catécholamine S carry two hydroxides groups in position 3 and 4 of the ring phényl.
the Phenylalanine and the Tyrosine carry a carboxylic group in position alpha.

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