system
Given the following post, respond as if you're commenting on Reddit:
human
Why is the most common psychological side effect "suicidal tendencies"? 

I know there's an aspect of confirmation bias here, but it seems like more often than not a side effect of various drugs is "suicidal thoughts or tendencies."

Why is this such a common side effect? Is there some aspect of brain chemistry that makes us susceptible to it? Why aren't there side effects like "Sudden insatiable curiosity" or "unbearable clinginess" or "sudden hyperfocus on work and other tasks"?
gpt
This can be a side effect of anti-depression drugs. We are not sure of the exact mechanism, but here's the current thinking. 

The most severely depressed patients often have suicidal thoughts already. When treatment begins, the patient may start to have more energy and motivation first, days or weeks before their depressed mood is alleviated. So where they previously only had a vague idea of self-harm, with treatment they have the energy and motivation to form a detailed plan, and act on it.