Invega sustenna 150mg injection contains an active component as Paliperidone. It is an antipsychotic medication for schizophrenia and related mental disorders like schizoaffective disorder. It belongs to a class of drugs known as atypical antipsychotics. This medication works by affecting certain neurotransmitters in the brain, specifically dopamine and serotonin, which regulate mood, behavior, and cognition. Schizophrenia is a chronic mental disorder characterized by delusions (false beliefs), hallucinations (false perceptions), disorganized thinking, disorganized or catatonic behavior, and negative symptoms such as reduced emotional expression or motivation. Schizoaffective disorder is a condition that combines symptoms of schizophrenia with mood disturbances, such as depression or mania. Individuals with schizoaffective disorder experience a combination of psychotic symptoms and mood episodes.