Outpatient Programs (OP) are for those seeking mental rehab or drug rehab, but who also stay at home every night. The main difference between outpatient treatment (OP) and intensive outpatient treatment (IOP) lies in the amount of hours the patient spends at the facility. Most of the time an outpatient program is designed for someone who has completed an inpatient stay and is looking to continue their growth in recovery. Outpatient is not meant to be the starting point, it is commonly referred to as aftercare.
Intensive Outpatient Programs (IOP) are for those who want or need a very structured treatment program but who also wish to live at home and continue with certain responsibilities (such as work or school). IOP substance abuse treatment programs vary in duration and intensity, and certain outpatient rehab centers will offer individualized treatment programs.