NEW YORK (AP) — Prescriptions of the overdose-reversing drug naloxone are soaring, and experts say that could be a reason overdose deaths have stopped rising for the first time in nearly three decades.

The number of naloxone prescriptions dispensed by U.S. retail pharmacies doubled from 2017 to last year, rising from 271,000 to 557,000, health officials reported Tuesday.

The United States is in the midst of the deadliest drug overdose epidemic in its history. About 68,000 people died of overdoses last year, according to preliminary government statistics reported last month, a drop from the more than 70,000 in 2017.

“One could only hope that this extraordinary increase in prescribing of naloxone is contributing to that stabilization or even decline of the crisis,” said Katherine Keyes, a Columbia University drug abuse expert.

About two-thirds of U.S. overdose deaths involve some kind of opioid, a class of drugs that includes heroin, certain prescription painkillers and illicit fentanyl. Naloxone is a medication that can reverse opioid overdoses, restoring breathing and bringing someone back to consciousness. It first went on sale in 1971 as an injection. An easier-to-use nasal spray version, Narcan, was approved in 2015.

Local, state and federal officials have embraced naloxone as a lifesaving measure. Cities and states have standing orders that allow pharmacies to give it out without a doctor’s prescription, and officials have tried to put it into the hands of virtually anyone who might encounter a person overdosing, including drug users, police and even librarians.