The epidemiology of depression and the evolution of treatment.

Depression is a prevalent and pernicious disorder. About 1 in 5 US adults have at least 1 lifetime episode of major depression. Of those with depression, the majority will relapse over the long-term and many will have poor mental health outcomes and psychosocial disabilities. Over the past century, a range of treatments, including medications with varying mechanisms of action, have been developed to manage depression. Treatments from seizure therapies to an array of medications--amphetamine, tricyclic antidepressants, monoamine oxidase inhibitors, mixed-action antidepressants, selective serotonin reuptake inhibitors, and dual reuptake inhibitors--have evolved. © Copyright 2012 Physicians Postgraduate Press, Inc.