This Treatment Improvement Protocol (TIP) reviews the use of the three Food and Drug Administration (FDA)-approved medications used to treat opioid use disorder (OUD)—methadone, naltrexone, and buprenorphine—and provides guidance for healthcare professionals and addiction treatment providers on appropriate prescribing practices for these medications and effective strategies for supporting the patients utilizing medication for the treatment of OUD. The goal of treatment for opioid addiction or OUD is remission of the disorder leading to lasting recovery. Recovery is a process of change through which individuals improve their health and wellness, live self-directed lives, and strive to reach their full potential. This TIP also educates patients, families, and the general public about how OUD medications work and the benefits they offer.