 However, some psychology professionals still push for the reduction of neuroleptic drugs, as there is a popular belief that post-schizophrenic depression is caused by neuroleptic treatment.Therapists are also believed to engage the depression in people with schizophrenia, having given too much psychotherapy after the patient had overcome their schizophrenic symptoms.Schizophrenia itself should not be overlooked as a key player in causing post-schizophrenic depression, though.