About Winchester CTC Methadone Clinic in Winchester, VA Winchester Comprehensive Treatment Center (CTC), which is located in Winchester, Virginia, provides outpatient medication-assisted treatment for adults who are struggling with opioid addiction. Our CTC serves adults age 18 and older of all genders. Medication-assisted treatment, or MAT, is a form of opioid addiction treatment that incorporates prescription medications and counseling. This type of care has been used in methadone clinics in the United States for several decades, and it has proved to be both safe and effective.