Sanofi is recalling hundreds of thousands of epinephrine injectors used to treat severe allergic reactions because they may not deliver the correct amount of the life-saving drug.

The recall includes all Auvi-Q injections currently on the U.S. market, or roughly 490,000 packs of the devices, the company says. Most packs include two injectors.

Sanofi's product competes with Mylan's EpiPen, which is a staple of first-aid care. Both products are used to treat allergic reactions caused from , foods, medicines or other substances.

About 200,000 people in the U.S. have Sanofi's injector, according to company estimates.

Consumers can call 1-866-726-6340 or visit the product's website for information on how to return the injector. They should also contact their to get a prescription for an alternate device.