Treated drug overdoses are on a record pace in New York City jails this year, even as corrections officials boost efforts to stop fentanyl from being smuggled in.

Nearly 150 suspected overdoses were treated with Narcan, which counteracts the effects of opioids, between January and April, putting the jail system on a trajectory that would see over 400 overdoses in a year for the first time in history, according to a Correctional Health Services report.

The Department of Corrections has said fentanyl is coming in through the mail, in drug-soaked cards, letters, and even a book, from which inmates tore pages to smoke or ingest.

If the rate of treated overdoses continues as it has, it will roughly double the yearly total for 2020, when Narcan was administered to 220 inmates.

Suspected overdoses were treated 347 times the following year and 325 times in 2022.

Meanwhile, DOC has trained almost 5,000 staffers to use Narcan, and Commissioner Louis Molina told The Post the department has trained dogs to sniff out fentanyl, which is up to 100 times stronger than morphine and was responsible for 71,450 deaths nationwide last year, according to the CDC.