Fentanyl, heroin use found to substantially decline in patients receiving methadone treatment for opioid use disorder

A new study led by a Johns Hopkins Bloomberg School of Public Health researcher found that the percent of patients treated for opioid use disorder with methadone significantly decreased their use of fentanyl during a year of treatment. The percent who tested positive for fentanyl declined on average from 21.8 percent in week one to 17.1 percent in week 52.