NORTHAMPTON — An especially dangerous batch of heroin is circulating in the Northampton area, Police Chief Jodi Kasper said in a Facebook post.

Police responded to three overdose calls on Friday alone.

The heroin being sold in the area is apparently laced with fentanyl, making to up to 50 times more potent than straight heroin, she said.

Kasper said valuable information for both addicts and their families is available at www.hampshirehope.org. The site includes information about overdose prevention, Narcan training, area hotlines, detox programs, medication-assisted recovery programs and support.