About Eau Claire Comprehensive Treatment Center in Eau Claire, WI Located in Eau Claire, Wisconsin, Eau Claire Comprehensive Treatment Center (CTC) provides medication-assisted treatment (MAT) to adults age 18 and older of all genders. We use medications such as methadone, buprenorphine, naltrexone, and Suboxone to help patients stop using opioids and start functioning at a higher level. By taking part in MAT at our Eau Claire opioid addiction treatment center, patients can reduce opioid cravings and withdrawal symptoms.