system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do antidepressant pills work?
gpt
SSRIs (selective serotonin reuptake inhibitors) target low levels of serotonin in the brain, which scientists believe to be the chemical/hormone we make that relates to mood. Lower serotonin, depression. The SSRIs try to level that out. There are many other types of antidepressants, but SSRIs are the most common. Each class of antidepressants works a little differently. Antidepressants also treat eating disorders and other mental illnesses.