A comparison of adherence, outcomes, and costs among opioid use disorder Medicaid patients treated with buprenorphine and methadone: A view from the payer perspective.

Medication-assisted treatment (MAT) with methadone or buprenorphine has been shown to be more effective at reducing the use of illicit opioids, the risk of drug-related overdose, and overall healthcare costs, on average, compared to abstinence-based addiction treatments for individuals with an opioid use disorder (OUD). Individuals who are adherent to MAT are more likely to experience positive outcomes. We used physical and behavioral Medicaid claims data of individuals newly treated with methadone (n = 212) and buprenorphine (n = 972) to examine the overall predictors of adherence, differences in adherence to each medication, the relationship between adherence and ED nonfatal drug-related overdose, and differences in total cost of care between the two medications. We found that older individuals and women had significantly lower risk of non-adherence. At six months, only 3.6% of individuals who were adherent to either treatment experienced a nonfatal drug-related overdose in the ED, compared to 13.2% of individuals who were non-adherent. We found no significant difference between methadone and buprenorphine on nonfatal drug-related overdose. Non-adherence to methadone was associated with a significant increase in total cost of care. Implications for how these results could be used to improve the overall impact of MAT are discussed.