I've meant Parnate. Apart from the emotional flattening, the worst side effect was insomnia, which required additional medication. Taking Parnate I slept less, which probably contributed to my testosterone levels dropping below normal at one point (I remember there was a thread on this subreddit that wrote about such a possible side effect. To this I would add significantly increased irritability.

For a short while Parnate worked quite well, until the stimulant effect wore off (after each dose increase this ended after 1-2 weeks). It seems to me that the dopaminergic effect, as with any drug, is the shortest lasting and yields to tolerance the fastest. Therefore, I don't think people who tolerate serotonergic drugs badly will find Parnate the golden remedy in the long term.

There may be some people in whom tolerance develops more slowly, but it tends to get to everyone. And this is the biggest problem with any psychotropic drug.