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Efexor®XR belongs to a class of drugs called serotonin and norepinephrine reuptake inhibitors (SNRIs)1. The actions of SNRIs result in improving neurotransmission of two neurotransmitters, serotonin and norepinephrine in the brain2. The dual action of SNRIs is believed to improve mood symptoms2.


  1. Efexor®XR (venlafaxine) Prescribing Information. Pfizer Corporation Hong Kong Limited: version February 2018.
  2. Moret C and Briley M. The importance of norepinephrine in depression. Neuropsychiatric Disease and Treatment 2011:7(Suppl 1)9-13.
[PP-CPF-HKG-0053] Sep 2019