Lewisville is one of the most populous cities in Texas as well as one of the fastest-growing city populations in the U.S. Over the years, the numbers have increased tremendously. As of 2018, it had a population estimated at 106,586. With a land area of 111.9 km², Lewisville is not a small city. People suffering from opioid dependency in this city may visit any methadone clinic Lewisville for assistance. Methadone clinics are formed particularly for the purpose of prescribing and administering medications used for medication-assisted drug therapy treatments. All Methadone clinics in Texas are required to be accredited by the Substance Abuse and Mental Health Services Administration. Methadone is an effective opioid agonist. It is a part of the medication-assisted treatment given to a patient exhibiting the signs and symptoms of opioid use disorder. What makes up the other part is usually counseling and behavioral therapies. Methadone treatment is to be received under the supervision of a practitioner. The length of time varies. Some patients may complete medication within 12 months while others may require long-term maintenance. The medication-assisted treatment practitioner monitors the situation and gradually reduces the dosage to avoid withdrawal. In some cases, after some level of stability, the patient is allowed to take methadone at home, between visits.