The Food and Drug Administration is working with Pfizer to extend the expiration dates for some EpiPens amid a national shortage of the allergy drug.
Pfizer will extend by four months expiration dates of EpiPen 0.3 milligram Auto-Injectors and its authorized generic.
"Patients should have confidence in using the products from these particular lots as Pfizer works to stabilize supply, which is anticipated in the fourth-quarter of 2018," Pfizer said in a statement Tuesday.
The extension does not apply to EpiPen Jr., an injector for children that contains a smaller dose of epinephrine.
The decision to extend the expiration for some batches of the EpiPen is based on a review of product stability data, Pfizer said.
There has been a nationwide shortage of epinephrine injection devices since February.
Pfizer, the manufacturer of the EpiPen, cited manufacturing constraints for the shortage.
"Pfizer is working tirelessly to increase production and expedite shipments as rapidly as possible," Pfizer said in a statement. "Currently supplies vary from pharmacy to pharmacy, and we cannot guarantee that product will be available at all pharmacies."
The full list of EpiPens with extended expiration dates is available on Pfizer's website.