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Emergency crews in Vancouver say they are dealing with an "extremely high" number of overdose calls, including 174 last week.

The city says the number of overdose calls Vancouver Fire and Rescue Services received between Feb. 26 to March 5 was the highest so far this year, and much higher than historical data.

The majority of the calls were in the Downtown Eastside, but the number of cases outside the downtown area also increased.

Vancouver police also reported 14 suspected overdose deaths across the city last week, six more than the previous week.

Mayor Gregor Robertson says drug overdose deaths due to the ongoing fentanyl crisis continue to have a devastating impact throughout Vancouver.

"The city shoulders a huge burden of the drug overdose response, and our first responders and frontline community workers are at a breaking point," he said in a news release on Thursday.

A record 922 people died from overdoses last year in B.C., which has declared a public health emergency. The city says nearly 25 per cent of those deaths were in Vancouver.