About Brockton Comprehensive Treatment Center in Brockton, MA Brockton Comprehensive Treatment Center, located in Brockton, Massachusetts, is an outpatient clinic that provides medication-assisted treatment (MAT) to adults of all genders age 18 older. Patients who are struggling with opioid use disorder, the clinical term for opioid addiction, can find recovery with the guidance of our multidisciplinary team of physicians, nurses, and counselors. Years of research has shown that MAT improves a person’s recovery outcomes and lessens their risk of relapse.