Hello paranoid android,
I wasn't aware it was possible to OD from St John's Wort, from what I have read it is relatively safe, if anything, safer than classical anti-depressants which my doctor could put me on, I am taking a low dose of about 300mg per day. Anyways I needed to detox from Invega as it turned my life into a hell, living with both dopamine and serotonin receptors blocked makes me feel like a total zombie.
I don't have any preexisting condition, my psychosis was purely caused by drug abuse, I don't even believe i should have been prescribed with neuroleptics to begin with, had I stayed clear from LSD and weed for a week or two, i would have returned to normal by myself but that's not how the mental health system works, they didn't hesitate to give me a shot of Invega without regards for the side effects, I want to say that it's easy to turn someone into a vegetable and say that he is "cured" because no more symptoms are visible, but hitting me with a hammer to the head would have had the same beneficial effects...
Now I'm in a situation where life is very difficult, I struggle hard to get by every day and have looked into any possible solution for helping solve my problem; St John's wort seemed like the safest solution.
Just to finish and vent a bit, I wanted to say that I think antipsychotics should be used on people who really need them, like schizophrenics and people suffering from permanent psychosis, like you say, people with preexisting conditions. I personally find it unethical to shoot people with this medicine when the suffering is temporary and drug-induced. I believe the ethical decision would be to let the drugs who caused the psychosis leave the body and see if the situation normalises, only if the psychosis persists after the drugs are cleared should antipsychotics be considered. I feel like I have been victim of an injustice and simply crushed by the mental health system. I am not schizophrenic (which is why my doctor agreed that I should stop Invega in the first place) and suffer from absolutely no symptoms as long as I am not taking drugs.
Anyways, that's just my opinion on the matter, I say leave the neuroleptics for people who cannot live without.
Cheers!