system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How/why can antidepressants increase thoughts of suicide?

In most antidepressant advertisements, they say "_____ may increase thoughts of suicide in teens and young adults" or something in that vein. 

I have a basic understanding of how SSRIs work, but what is it about these medications that can lead to more thoughts of suicide? Isn't that a major reason they're prescribed in the first place?
gpt
For some very depressed people, the only thing stopping them from committing suicide is the lack of motivation to do so, brought on by depression.  As the treatment works, it can, in rare cases, give them just enough motivation to actually go through with it.