By eHow Health Editor
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Effexor is an antidepressant in a class of drugs known as serotonin and norepinephrine reuptake inhibitors (SNRIs). The drug was originally created to treat clinical depression. It was the first of its kind to be approved to treat social anxiety disorder. Effexor works to replace both serotonin and norepinephrine, chemicals in the brain believed to regulate mood.
eHow Health Editor