Having taken a couple of psychiatric drugs over a long period (antidepressents - ADs), I',m not sure where your claim that "they're addictively mood enhancing"

Having taken a couple of psychiatric drugs over a long period (antidepressents - ADs), I',m not sure where your claim that "they're addictively mood enhancing" comes from. IME ADs aren't. My brother has needed to take many more (edit: diverse kinds, not just ADs). I don't think he found them addictive (or even useful). Why do you feel they are?