Switching antidepressants after a first selective serotonin reuptake inhibitor in major depressive disorder: a systematic review.

Selective serotonin reuptake inhibitors (SSRIs) are frequently used as a first antidepressant for major depressive disorder but have response rates of 50% to 60% in daily practice. For patients with insufficient response to SSRIs, switching is often applied. This article aims to systematically review the evidence for switching pharmacotherapy after a first SSRI.