A residential or an inpatient program requires the patient to stay in residence in the treatment facility for the length of their treatment. This way, a patient is under round-the-clock medical supervision. A person spends most of his day in different types of treatment interventions to receive the highest level of comprehensive care. Further, the patient is allowed minimum and controlled contact with the outside world so that they can focus solely on their recovery.
Intensive outpatient program (IOP) is not as long as PHPs. A patient enrolled in an IOP needs to spend fewer hours at the treatment facility (2 to 4 hours per day for 3 to 4 days a week), compared to a PHP where a patient spends significantly more time (4 to 6 hours per day, and sometimes, even 8 hours per day for 5 to 7 days a week). In a way, a PHP is a step-up from an IOP and a step-down from a residential or inpatient program. One can get into a PHP after taking an inpatient program and then taper into an IOP.
On the other hand, sometimes, a person enrolled in an IOP might feel that they need additional monitoring, care, and structure which is usually offered in a PHP. In such cases, they may be advised by a medical professional to advance into a PHP. In comparison to an IOP, PHP offers more time to explore and deal with issues related to an addiction.