About Indianapolis Comprehensive Treatment Center in Indianapolis, IN Located in Indianapolis, Indiana, Indianapolis Comprehensive Treatment Center (CTC) provides medication-assisted treatment (MAT) to adults age 18 and older who are struggling with opioid addiction. Many years of scientific research indicates that MAT is a safe, effective way of allowing people to achieve long-term recovery from opioid use disorder, which is the clinical term for opioid addiction. Combined with a therapeutic component, the medication element of MAT helps reduce opioid cravings and eliminate the painful withdrawal effects that would otherwise occur.