Hi NotCrzy, I don't recall this conversation. I can tell you from personal experience that anti depressants can make a person feel crazy. I was put on them for years a variety that keep increasing, mood stabilizers, anti depressants and a ton of others to the mix and found they kept me depressed and feeling horrible about myself.
However that said, if a Psychopath told me they were taking them their lips would be moving and I am not sure I would believe them but think more a move to get sympathy or an act to explain away their horrific behavior and win a person back getting them to think they are "working" on their issues.
If you would be able to explain more perhaps I could have more input, did the Psychopath in your life say they were taking them?