Two cases have been reported where the faulty part prevented the injector from working, though neither of them were in North America.
Epi-Pens contain epinephrine and are auto-injectors used in cases of life-threatening allergic reactions causing anaphylaxis, or swelling of the airways. Common triggers include different foods, insect stings, medications and latex.
In Canada, the recall affects EpiPen 0.3 mg with a May 2017 expiry date and EpiPen Jr. 0.15 mg with an expiry date of March 2017.
The pens were distributed between January and March of last year.
Pfizer will be replacing the pens at no charge, and is asking those with them to keep them until they receive their replacement. More information is available at www.pfizer.ca and on the EpiPen Canada Facebook page.