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| Clinical data | |
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| Pronunciation | /fɛnˈɛθələmiːn/ | 
| Dependence liability | Psychological: low–moderate Physical: none | 
| Addiction liability | Low (without an MAO-B inhibitor) Moderate (with an MAO-B inhibitor) | 
| Routes of administration | Oral | 
| ATC code | 
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| Legal status | 
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| Pharmacokinetic data | |
| Metabolism | Primarily: MAO-B and ALDH Other enzymes: MAO-A, SSAOs, PNMT, AANAT, FMO3, and others | 
| Biological half-life | Exogenous: 5–10 minutes Endogenous: ~30 seconds | 
| Identifiers | |
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| Synonyms | 1-amino-2-phenylethane | 
| CAS Number | |
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| ECHA InfoCard | 100.000.523 | 
| Chemical and physical data | |
| Formula | C8H11N | 
| Molar mass | 121.18 g/mol | 
| 3D model (Jmol) | |
| Density | 0.9640 g/cm3 | 
| Melting point | −60 °C (−76 °F) | 
| Boiling point | 195 °C (383 °F) | 
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Phenethylamine (PEA), also known as β-phenylethylamine (β-PEA) and 2-phenylethan-1-amine, is an organic compound and a natural monoamine alkaloid, a trace amine, and also the name of a class of chemicals with many members that are well known for their psychoactive and stimulant effects.
Phenylethylamine functions as a monoaminergic neuromodulator and, to a lesser extent, a neurotransmitter in the human central nervous system. It is biosynthesized from the amino acid L-phenylalanine by enzymatic decarboxylation via the enzyme aromatic L-amino acid decarboxylase. In addition to its presence in mammals, phenethylamine is found in many other organisms and foods, such as chocolate, especially after microbial fermentation. It is sold as a dietary supplement for purported mood and weight loss-related therapeutic benefits; however, orally ingested phenethylamine is primarily metabolized in the small intestine by monoamine oxidase B (MAO-B) and then aldehyde dehydrogenase (ALDH), which convert it to phenylacetic acid. This prevents significant concentrations from reaching the brain when taken in low doses.