Some outpatient addiction treatment programmes combine the treatment of co-occurring mental health illnesses with the treatment of substance abuse. Co-occurring mental health illnesses affect up to 60% of people with substance use disorders, and many can benefit from treatment for both diseases at the same time.
According to research, treating both diseases together is more successful than treating each disorder separately.
However, people with severe mental health or substance use disorders may require a higher level of care, and be better suited to inpatient treatment and rehab.