A police report on a two-night rave in Edmonton says drug use was so bad on the second night that on-site doctors ran out of life-saving Valium injections to treat victims and had to ask for more.

The report on April's Elements Music Festival also suggests an unsupervised entrance was the portal for illegal drugs into the venue at the city's Northlands complex.

Drugs were brought in through a DJs and promoters entrance not supervised by police or security, or were tossed over a fence into a smoking area, the report said.

"I'm concerned that despite all the best efforts ... we're still seeing an infiltration of illegal drugs," said Coun. Dave Loken. "I don't really know where to go from here ... other than possibly looking at banning large scale events like this."

There's a balance between fun and people getting hurt, he said.

"I don't want to be seen as creating conditions for people to go and partake in these in illegal drugs," Loken said. "That's a dilemma for me."

It also says that over two nights, several patrons had to seek on-site medical help for life-threatening conditions.

Sgt. Nicole Chapdelaine of the city's Public Safety Compliance Team says that without prior emergency medical planning, the likelihood of someone dying from an overdose would have been extremely high.

The report, which will go to the city's executive committee next week, says one patron is still in intensive care and may need acute medical aid for the rest of their life.

With files from Canadian Press