About Western Michigan Comprehensive Treatment Center in Grandville, MI Western Michigan Comprehensive Treatment Center (CTC), located in Grandville, Michigan, delivers medication-assisted treatment (MAT) to adults age 18 and older who are struggling with opioid addiction. While some methadone clinics offer one type of medication to people taking part in MAT, our Grandville opioid addiction treatment center provides Suboxone, naltrexone, methadone, and buprenorphine. These medications can have varying effects depending on the patient, so we’ll work with you to determine which one and what dosage is right for your recovery goals.