Naltrexone is not an opioid; it is used in medication-assisted treatment to block the effects of opioids such as heroin and morphine, and is not addictive, according to the Substance Abuse and Mental Health Services Administration. Naltrexone was described inaccurately in a report Thursday. Also incorrect was a sentence about officials’ description, at a news conference at Brattleboro Memorial Hospital, of buprenorphine’s safety compared with other substances.

The Sentinel regrets the errors.