S-Venlafaxine is an optically active version of Venlafaxine . Venlafaxine is a derivative of phenylethylamine which is reported to facilitate neurotransmission within the central nervous system via blocking the presynaptic reuptake of neuroamines such as serotonin (5-hydroxytryptamine; 5-HT) and noradrenaline (norepinephrine). Venlafaxine is also reported to be a weak inhibitor of dopamine reuptake.|In vitro|studies indicate that Venlafaxine does not demonstrate significant activity for muscarinic, histaminergic or α-1 adrenergic receptors. The metabolism of venlafaxine is reported to occur by cytochrome P450 (CYP) enzyme CYP2D6 yielding O-desmethylvenlafaxine. A lesser metabolite, N-desmethylvenlafaxine is produced by CYP3A4.
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