The document summarizes a study on the impact of antidepressant medication adherence on health services utilization and costs. The study found that patients who adhered to their antidepressant medication had fewer inpatient hospital days but more emergency department and outpatient physician visits. Adherent patients also had lower total healthcare costs of $646 compared to non-adherent patients. The results suggest that programs to increase antidepressant medication use and adherence may reduce total healthcare costs for payers and employers.