Under the new rules, drivers aged 21 and under aren't allowed to consume any alcohol before getting behind the wheel.
Those who violate the policy will face major penalties, including having their licence suspended and fines up to $600.
The policy will affect about 110,000 drivers in the province.
The law was first introduced in Quebec in December 2010.
Ontario, Manitoba, Nova Scotia and New Brunswick already have a similar policy in place.
Also on HuffPost