I didn’t get the sense they were talking about antidepressants, mainly because that’s not how anti depressants work.
I think they were referring more toto “magically becoming a conservative MAGAT.” They are famous for not caring about issues unless they’re directly affected and being quite callous up until that point.
They do care about things that don’t affect them, though. They care about repressing and punishing people who are marginalized. The premise of the question lacks that bit of nuance.
I don’t know the stats, but I would think people who take antidepressants are more likely to be left leaning (concerning themselves with issues that don’t effect them, in a caring way) than right leaning (concerning themselves with issues that don’t effect them, in a punishing way) because it is a common belief in the latter group that caring for your mental health is some kind of liberal conspiracy.
I know plenty of people on antidepressants and anti anxiety medications that are activists. And plenty of people who would benefit from them but think it’s for “libruhls.”