Last edited on January 15, 2021 Psychotic Disorders Primer Psychotic disorders are a group of severe mental disorders are characterized by changes in thought, reality-testing, and perception. Psychotic Disorders Brief Psychotic Disorder Delusional Disorder Delusional Parasitosis (Morgellons Disease) Schizoaffective Disorder Schizophrenia Schizophreniform Disorder Substance/Medication-Induced Psychotic Disorder Postpartum Psychosis