Just about all common psychological medication (by which I mean antidepressants, antipsychotics, ADHD meds, etc) have a pretty weakly measurable effect and eff

Just about all common psychological medication (by which I mean antidepressants, antipsychotics, ADHD meds, etc) have a pretty weakly measurable effect and effectiveness. If you take them, your symptoms might improve. In some casesthey'll get a lot worse. In many cases it will have no effect on your symptoms. There are lots of side effects. What's the difference here?