Rock Hill, a city with a population estimated at 74,309 as of 2018, is rated the fifth largest city in the U.S. state of South Carolina. Its population makes it a possible home to several people experiencing opioid use disorder. The city has a total area of 101.4 km² on which some methadone clinics could be found. It is the largest city in York County. Residents of the city or neighboring ones may medically treat opiate addiction at any Rock Hill methadone clinic. Generally, methadone clinics are specialists in the treatment of opiate addiction, some methadone clinics in South Carolina provide more services, which may include consultation and mental health services. Doses of methadone are only available through an opioid treatment program because, like other drugs, methadone is at the risk of being diverted to the illicit market and its issue could cause some health issues. The drug is effective, safe, and has been used to treat many cases of opioid addiction which earned it a slot on the World Health Organization’s list of essential medications. Its doses are available in powder, diskettes, and liquid forms. The doses may not be shared between patients because each program enrollee is given exactly what is required.