The term depression describes a group of conditions characterized by significant and sustained periods of low mood, associated with a syndrome, or group, of accompanying characteristics and symptoms. Although writers have described episodes of depression since antiquity, only recently have we recognized that the depressive disorders are among the most common and disabling medical conditions throughout the world. Depressions are outside the bounds of normal fluctuations of mood; they are not simply extreme periods of sadness.
Treatment plan for depression will depend on the type you have and how severe it is. For instance, your doctor may suggest brain stimulation techniques such as electroconvulsive therapy (also called ECT or electroshock therapy), transcranial magnetic stimulation, or vagus nerve stimulation. If you have bipolar depression, your doctor may prescribe different types of medicines, such as mood-stabilizing drugs or certain antipsychotic medicines, instead of antidepressants. SSRIs (selective serotonin reuptake inhibitors) are the most commonly prescribed type of antidepressant.
Cold spring harbor laboratory. (n.d.) Background to Depression. Retrieved from https://www.dnalc.org/view/890-Background-to-Depression.html
WebMD Medical Reference. (May 15, 2015). Depression Treatment: Your Options. Retrieved from http://www.webmd.com/depression/guide/depression-treatment-options#1