R-文拉法辛是文拉法辛的光学活性形式。文拉法辛是苯乙胺的衍生物，据报道可通过阻止神经胺如5-羟色胺（5-羟色胺； 5-HT）和去甲肾上腺素（去甲肾上腺素）的突触前再摄取来促进中枢神经系统内的神经传递。还报道了Velanfaxine是多巴胺再摄取的弱抑制剂。|体外研究表明，Venlafaxine对毒蕈碱，组胺能或α-1肾上腺素受体没有明显的活性。据报道，文拉法辛的代谢是通过细胞色素P450（CYP）酶CYP2D6发生的，产生O-去甲基文拉法辛。CYP3A4产生较少的代谢产物N-去甲基文拉法辛。 R-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). Velanfaxine 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.