Selective serotonin reuptake inhibitors are medicines that relieve symptoms of depression. Selective serotonin reuptake inhibitors, also known as SSRIs or serotonin boosters

Selective serotonin reuptake inhibitor.

SSRI stands for Selective Serotonin Reuptake Inhibitor. A group of anti dipressants SSRI stands for Secure Storage and Retrieval of Information.

to prevent or relieve depression

The S stands for serotonin and the N stands for norepinephrine and RI stands for reuptake inhibitor. So, obviously these drugs are supposed to work on both serotonin and norepinephrine. However, some literature uses SNRI to mean Selective Norepinephrine Reuptake Inhibitor, and this will work better on norepinephrine. Then you have the SSRI which is Selective Serotonin Reuptake Inhibitor, which works better on serotonin.