Ok I fixed what you messed up, atypical antipsychotics DO antagonize the 5HT2A receptor, not agonize, I believe that you are confusing the tendency of atypical antipsychotics to partially agonize the 5HT1A receptor with the 2A receptor. Psychedelic drugs agonize the 5HT2A receptor and have been shown to potentiate psychosis in schizophrenic patients.