A recall of the emergency anti-allergy medicine EpiPen is expanding to the U.S. and other markets in North America, Europe, Asia and South America because the allergy shots may not work.

The notice issued Friday by Mylan N.V. expands upon warnings made earlier this month after two reports of the device failing.

Mylan didn't immediately respond to a question about how many devices are affected by the recall. The U.S. Food and Drug Administration says the recall covers 13 lots distributed from December 2015 through July 2016.

The problems could be potentially life-threatening, although Mylan described the incidence of the defects as "extremely rare."

The EpiPen is used to treat allergic reactions to certain food and bug bites.

The products can be replaced at no charge by calling 877-650-3494 or emailing customer.service@mylan.com.

Product/DosageNDC NumberLot NumberExpiration Date
EpiPen Jr Auto-Injector, 0.15 mg49502-501-025GN767April 2017
EpiPen Jr Auto-Injector, 0.15 mg49502-501-025GN773April 2017
EpiPen Auto-Injector, 0.3 mg49502-500-025GM631April 2017
EpiPen Auto-Injector, 0.3 mg49502-500-025GM640April 2017
EpiPen Jr Auto-Injector, 0.15 mg49502-501-026GN215September 2017
EpiPen Auto-Injector, 0.3 mg49502-500-026GM082September 2017
EpiPen Auto-Injector, 0.3 mg49502-500-026GM072September 2017
EpiPen Auto-Injector, 0.3 mg49502-500-026GM081September 2017
EpiPen Auto-Injector, 0.3 mg49502-500-026GM088October 2017
EpiPen Auto-Injector, 0.3 mg49502-500-026GM199October 2017
EpiPen Auto-Injector, 0.3 mg49502-500-026GM091October 2017
EpiPen Auto-Injector, 0.3 mg49502-500-026GM198October 2017
EpiPen Auto-Injector, 0.3 mg49502-500-026GM087October 2017