I’m absolutely in favour for building better social supports for new comers and people below the poverty line, but immigration is not the source of the problem. Suppressed wages are not going to change with increasing social supports or restrictions on immigration. Change will only come about with hard organized resistance against the minority who profit off the backs of the majority.
Second generation antipsychotic medications are not only dopamine antagonists but also potent serotonin antagonists. Regulating serotonin uptake can help stabilize mood, both with depression and elevated states. So possibly more to do with their effects on serotonin receptors than dopamine receptors. (Not a doctor but nothing I said can’t be confirmed with a quick google scholar search)