This is an academic paper that provides a synopsis of the evidence for methadone as a medication for opioid use disorder (MOUD). The study concludes that methadone is associated with improved outcomes for individuals and pregnant women with opioid use disorders, and that methadone should be a covered service available to all individuals.
Fullerton, C. A., Kim, M., Thomas, C. P., Lyman, D. R., Montejano, L. B., Dougherty, R. H., Daniels, A. S., Ghose, S. S., & Delphin-Rittmon, M. E. (2014). Medication-Assisted Treatment With Methadone: Assessing the Evidence. Psychiatric Services, 65(2), 146–157.