Photo: VicPD

Police in Victoria are investigating a crash believed to be caused by an overdose behind the wheel. 

CTV News reports officers were called to the two-car crash Tuesday afternoon, arriving to find an injured man being treated by an off-duty doctor. 

Paramedics began to notice signs of opioid overdose, and hit the driver with a dose of naloxone, causing him to regain consciousness. 

"He was unconscious and in potentially life-threatening condition," Victoria police said in a news release.

No charges have been approved at this point, but an investigation remains underway. Witnesses have been asked to come forward.

with files from CTV Vancouver