About Fall River Comprehensive Treatment Center in Fall River, MA Fall River Comprehensive Treatment Center (CTC) serves adults age 18 and older of all genders who need outpatient treatment for opioid addiction. Our center, which is conveniently located in Fall River, Massachusetts, is a respected source of medication-assisted treatment, or MAT. MAT uses medication and counseling to prepare adults for successful long-term recovery from opioid addiction. Decades of research, dating back to when methadone clinics were only authorized to provide one type of medication, documents the effectiveness of MAT.