NCIt definition : The hydrochloride salt form of pargyline, a monoamine oxidase (MAO) inhibitor with
antidepressant activity. Pargyline selectively inhibits MAO type B, an enzyme catalyzing
the oxidative deamination and inactivation of certain catecholamines, such as norepinephrine
and dopamine, within the presynaptic nerve terminals. By inhibiting the metabolism
of these biogenic amines in the brain, pargyline increases their concentration and
binding to postsynaptic receptors. Increased receptor stimulation may cause downregulation
of central receptors which may attribute to pargyline's antidepressant effect.;