Efexor, or its scientific name, Venlafaxine, is one of the medications used to treat depression. The drug belongs to the family of selective serotonin reuptake inhibitors, which works to increase the percentage of neurotransmitters (seritonin and noradrenaline) in the nervous system, which is believed to help neurons send and receive receptors. The messages between them (nerve impulses), and thus help to improve mood, and remove depression. What are the reasons for using Efexor XR? This medicine is used to treat the following conditions: Efexor is used to treat depression. Efexor is used to treat panic attacks. Efexor is used to treat anxiety conditions. Efexor is used to treat "social anxiety disorder". A valid prescription should be available upon delivery