Sullivan, the county seat of Sullivan County, has a land area of 4.869 km². Although it is not a big city, some methadone clinics could be found in Sullivan. As of 2011, the city had a population estimated at 4,224. Inhabitants of Sullivan or neighboring cities who wish to medically treat opioid use disorder may visit any Sullivan methadone clinic for medication-assisted treatment. Opioid use disorder could be treated a number of ways, but an effective and safe one is using methadone, a drug approved by the Food and Drug Administration. The effects of opioids are short term, but methadone lasts long in the body. A dose could last up to 36 hours, but the medication-assisted treatment practitioner may decide to give more within those hours. Full recovery is not instant and there is no timeframe for the program. Some patients recover fast, which is within a year, while others are treated for a number of years. Treatment could go on indefinitely. It is safe and effective if taken in compliance with the directives from a medication-assisted treatment practitioner. At methadone clinics in Indiana, patients are not just given the drugs, but they are encouraged to participate in counseling sessions because of the possible psychological negative effects opioids might have caused.