About Dover Comprehensive Treatment Center in Dover, DE Dover Comprehensive Treatment Center (CTC), located in Dover, Delaware, provides medication-assisted treatment (MAT) on an outpatient basis for adults age 18 and older who are struggling with opioid addiction. MAT is an approach to opioid addiction treatment that combines prescription medication and counseling. Methadone clinics throughout the country have used this research-backed method for years due to its track record as a safe and effective way to treat opioid use disorder.