Gretna is the parish seat of Jefferson Parish and the second-largest city in the same place. It is home to a number of methadone clinics where people suffering from opioid use disorder may get medical treatment. Gretna has a total area of 11.65 km². As of 2018, it had a population estimated at 17,730. Residents of the city who are willing to medically treat opioid dependency may walk into any Gretna methadone clinic for assistance. One of the best ways to overcome opioid addiction is by treating it medically. There are three drugs approved by the Food and Drug Administration for such purpose. One is methadone. Doses of methadone are available in different forms including diskettes, liquid, and powder. Methadone is an opioid agonist with effects that last longer than opioids. A dose of methadone could last 36 hours, but the health provider may give more doses within those hours. Opioid withdrawal gives pains and uncontrollable craving but methadone restores calmness to be body, helping people get a grip on themselves. It has been included on the World Health Organization’s list of essential medications. However, it should not be taken without the supervision of a medication-assisted treatment practitioner. All methadone clinics in Louisiana are required to be accredited by the Substance Abuse and Mental Health Services Administration.