The voluntary recall is for a shipment labelled PK-10-20-13. In an advisory, Health Canada said it found "issues with the company's production practices" that could affect the product.
It's believed to be the first-ever marijuana recall announced by the federal health agency.
The shipment of medical marijuana in question was produced by Greenleaf Medicinals out of Nanaimo, B.C.
Greenleaf has informed Health Canada the company is "working with other licensed producers to find a supply of marijuana for the impacted clients."
Consumers were being asked to discontinue use, though anyone who has already used the product is not in danger, according to Health Canada.
The health agency's recall notice was posted online on April 18, two days before Sunday's annual "4/20" day, which celebrates cannabis culture.
Health Canada reminded the public that dried marijuana is not an approved drug or medicine in Canada, and that use and possession of marijuana is illegal unless authorized by a medical professional.