What is an SSRI?

An SSRI is a selective serotonin reuptake inhibitor, a common type of antidepressant that is often prescribed. 

Serotonin is a neurotransmitter that acts as a chemical messenger carrying information between nerve cells located in the brain.

Once the signal is transmitted amongst the brain cells, the serotonin is brought back to the cells for reuptake. However, an SSRI stops this process by blocking reuptake. This leaves more serotonin to be transmitted amongst brain cells.

SSRIs are known as selective due to their ability to affect serotonin, while not disrupting other neurotransmitters.