The patient was a 28-year-old woman with a 4-year history of schizophrenia and had previously been prescribed olanzapine, thioridazine, alprazolam, quetiapine, and risperidone before. The patient had a history of poor compliance. However, the patient reported no antipsychotic use for 20 days prior to the study. Amisulpride was given at 200 mg/day and increased to 800 mg/day after 14 days. The patient was switched to aripiprazole, and after 2 months of treatment, prolactin levels decreased to 17.78 ng/mL. The gene discussed is PRL; the disease is schizophrenia.