|Elimination half-life||~12 hours|
|CompTox Dashboard (EPA)|
|Chemical and physical data|
|Molar mass||134.182 g·mol−1|
|3D model (JSmol)|
Phenylethylidenehydrazine (PEH), also known as 2-phenylethylhydrazone or β-phenylethylidenehydrazine, is an inhibitor of the enzyme GABA transaminase (GABA-T). It is a metabolite of the antidepressant phenelzine and is responsible for its elevation of GABA concentrations. PEH may contribute to phenelzine's anxiolytic effects.