Delirium is a acute syndrome of disorientation caused by dysfunction of brain tissue and has a many varied symptom. The characteristic symptoms of delirium are conscious disturbance with disorientation and dys-mnesia and emotional disturbance.We experienced a 77 year-old male who had a hallucination and disorientation as well as delirium caused by antipsychotic medication, and whose condition was improved through discontinuing medication and traditional Korean medical treatment. We had given herb medication, acupuncture treatment and decreased medication to this patient, and observed. The patient`s delirium symptom had improved through oriental medical treatment and decreasing medication. It was able to improve a delirium caused by not specified origin and side effect of drug abuse through oriental medical treatment and decreasing medication.