About Waukesha Comprehensive Treatment Center in Waukesha, WI Adults in the Waukesha, Wisconsin, area who are struggling with opioid addiction can receive personalized outpatient care at Waukesha Comprehensive Treatment Center (CTC). Our center’s services include medication and counseling. This research-based, evidence-supported combination is known as medication-assisted treatment (MAT). MAT has been used in methadone clinics in the U.S. for several decades, and multiple studies have documented its effectiveness in helping patients end their opioid use, resist relapse, and remain in recovery.