If you're on anti-psychotics you should not be taking psychedelics or any illegal drugs as these will simply make your mental illness worse.
I understand your concern and it's legitimate, but in order for one to come to this realization it's going to be AFTER their diagnosis. And after another 5, 10, 20, maybe even 40 trips before they've hit "rock bottom" and don't want to trip anymore. Tripping with mental illness isn't going to send you to a mental hospital for life, especially if you're on meds. And it's certainly not going to kill you to take psychedelics on an anti-psychotic. But it will deteriorate your health and increase anxiety, maybe make for a paranoid trip (moreso true with weed than hallucinogens).
Let me just say my experiences with hallucinogens. I've done shrooms 20 times, acid 20 times, mescaline once and DMT a couple times. I'm diagnosed schizo-affective. When I was diagnosed I had only tripped acid 9 times....so the other 30+ trips were after I was diagnosed. As a result now I take abilify 20 mg a day instead of needing only maybe 5 mg a day. And I have more anxiety than I've ever had. My onset was previous to the 9 times I tripped acid initially and I needed those trips to gain clarity and understanding of the universe....previously I was so zonked out in my own fantasy world. I believe psychedelics have great benefits for mentally ill people, but at the same time there's a breaking point where you can't do it anymore, and negatives.
I love my life now. It is enriched, I am a productive member of society, despite tripping almost 50 times with schizo-affective disorder. I certainly can't trip anymore. So I'm definitely not DISAGREEING with you, or you making your post. And it's good you're putting the words into people with psychotic illnesses heads that they shouldn't trip, but ultimately it's gotta come from them. When they realize they can't trip anymore. I recently tripped .8 grams of penis envy after not tripping for a year...and I'm so glad I only did .8 grams. It was my final trip. And it was a good one. I tripped BALLS considering how little I took, and it was a great trip, but it increased my anxiety a little bit. So it was my epiphany, my shining moment...."I can't do this anymore". The meds can only do so much. And if I were to take 10 grams of shrooms right now....the rest of my life would be miserable...but fortunately I came to my epiphany on a .8 gram shroom trip.
I hope you feel me and understand where I'm coming from. I don't think you can truly understand the benefits of psychedelics or the negatives, for if you're mentally ill unless of course you're mentally ill. So I'm trying to explain what I experienced the best I can and hope someone can get something out of my post. That you're probably not gonna end up dead or something off one shrooms trip, but there's a breaking point. One can only tolerate so much psychosis..........so take your meds. If the acid and shrooms god's allow you to have a good trip on your meds like they did to me, then so be it maybe. But you're not gonna convince anyone to stop taking hallucinogens just because they take haldol or abilify or zyprexa. It's gonna come from themselves. Which happened for me finally. At the perfect time. I sometimes think God is watching out for me though, idk if everyones as fortunate. /End of rant
Be careful. Be safe everyone.