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 insect bites, 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 health provider to get a prescription for an alternate device.