“…There is an extensive literature evaluating and comparing different types of OPT, but studies are largely confined to analyses of detoxification versus maintenance, and assessments of specific medicines, such as methadone, buprenorphine, lofexidine, levomethadyl acetate, and naltrexone (Kleber, 2007; Mattick, Breen, Kimber, & Davoli, 2014; Stotts, Dodrill, & Kosten, 2009). While most of this literature is based on biomedical or clinical studies, social scientists have used qualitative and quantitative methods to capture both treatment provider perspectives (e.g., Berg, Arnsten, Sacajiu, & Karasz, 2009; Eversman, 2010; Larance et al, 2011; Lin et al, 2010; Philbin & Zhang, 2010) and patient perspectives (e.g., Anstice, Strike, & Brands, 2009; Conner & Rosen, 2008; Harris & McElrath, 2012; Lin, Wu, & Detels, 2011; Nyamathi et al, 2007; Treloar, Fraser, & Valentine, 2007). For example, numerous qualitative studies have used one-to-one interviews and focus groups (FGs) to provide in-depth insights into patients’ views and experiences of accessing and receiving methadone, the most frequently prescribed treatment for opioid use disorder globally (e.g., Jones, Power, & Dale, 1994; Koester, Anderson, & Hoffer, 1999; Murphy & Irwin, 1992; Neale, 1998, 1999a,b; Sohler et al, 2013).…”