Effexor vs Effexor xr Both effexor and effexor xr are anti depressant drugs of the selective serotonin noradrenalin reuptake inhibitor (SSNRI) category. Depression is considered to be a result of an unbalance of the serotonin levels and noradrenalin levels, where a decrease of these psychoactive chemicals results in a low mood, apathy and loss of […]