The 2025 American Heart Association guidelines made an important update to adult Basic Life Support by incorporating opioid antagonists such as naloxone directly into the adult BLS algorithms. This reflects the growing need for rescuers to recognize opioid-associated emergencies quickly and respond before respiratory arrest progresses to full cardiac arrest.

This change matters because opioid emergencies often begin as a breathing problem before becoming a circulatory one. By placing naloxone into the adult BLS framework, the AHA is reinforcing that early recognition, emergency activation, support of breathing, CPR when needed, and naloxone administration can all be part of the lifesaving response.

References
American Heart Association. Part 1: Executive Summary.
American Heart Association. Part 7: Adult Basic Life Support.