Nashville, the capital city of the U.S. state of Tennessee, is the most populous city in the state and the twenty-third most populous in the nation. It has a large area of 1,362 km² on which several methadone clinics can be found. Nashville is the county seat of Davidson County. As of 2018, it had a population estimated at 692,587. Residents may medically treat opioid use disorder at any methadone clinic Nashville. Three medications may be used to medically treat opiate addiction. The three drugs, of which methadone is one, are approved by the Food and Drug Administration. Methadone counters the adverse effects of opioids and helps people to get a grip on themselves. The drug minimizes pains and craving, helping people to function better socially, and ending their reliance on opioids. The medication has become so vital in the medical treatment of opiate dependence that it got a place on the World Health Organization’s list of essential medications. Some methadone clinics in Tennessee do not stop at opioid treatment programs, they offer more medical and social services. Although it is not harmful, doses of methadone should only be taken at methadone clinics accredited by the Substance Abuse and Mental Health Services Administration.