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Answering Some FAQs on Intensive Outpatient Programs IOP refers to the intensive outpatient program that treats substance use disorders & co-occurring mental health disorders. IOP provides group therapy as well as life skill classes for people with such issues. It’s intensive because of the schedule of the treatment. You might meet with the clinicians & support groups for a minimum of ten hours every week. Here are the commonly asked questions with answers that will clear the concept of IOP.