Police officers administered naloxone for first time just two hours after they had completed their training on the spray.
The constables responded to a call in Glasgow’s east end on Tuesday night having participated in a six-month test of carrying and using the intra-nasal spray to reverse an opioid-related drug overdose.
After successfully administering the spray, the man was stabilised before Scottish Ambulance Service clinicians arrived at the scene and took over emergency medical care.
Carrying naloxone is voluntary during the pilot, involving constables, sergeants and inspectors in Glasgow and Falkirk with officers in Dundee to begin training soon, once those involved have completed the training course.