When people receive methadone treatment for opioid use disorder, their use of the dangerous drugs heroin and fentanyl significantly declines, a new study shows.

But decreases in cocaine or methamphetamine use were not seen in a year of treatment, researchers report.

"Methadone treatment can have tremendous success reducing fentanyl and heroin use in individuals, but this study show...

Contrary to concerns, wider availability of naloxone treatment is not increasing heroin use among U.S. teens, new research finds.

Naloxone (Narcan) quickly reverses an overdose from opioids like heroin, fentanyl, morphine and oxycodone (OxyContin). There had been some worry that expanding access to naloxone might inadvertently promote high-risk substance use among young people. However, t...

Deaths from methamphetamine among Americans increased 50-fold between 1999 and 2021, a chilling new study reports.

Most of these deaths also involved heroin or fentanyl, according to researchers.

"The staggering increase in methamphetamine-related deaths in the United States is largely now driven by the co-involvement of street opioids," said lead researcher