CLAYTON, Mo. (AP) — A month after St. Louis County police began carrying Narcan, the opiate overdose antidote has already saved a life.

Police responded to a car crash on Wednesday on Interstate 55 in south St. Louis County. Officers saw that the 42-year-old driver’s skin was turning blue and he was sweating profusely. No pulse could be found and the officers began CPR.

Police spokesman Brian Schellman says the officers determined the symptoms were consist with opiate overdose and administered Narcan in each of the man’s nostrils. Paramedics arrived and continued treatment before taking him to a hospital.

Police say the victim is expected to make a full recovery.