PITTSBURGH (CBS News) — Mylan Pharmaceuticals is pulling one lot of Xanax from pharmacy shelves nationwide because of what the company said is “the potential presence of a foreign substance” in the popular prescription anti-anxiety drug.

The drug manufacturer cited a small chance of infection in recalling the batch of Alprazolam, the prescription drug sold under the brand name Xanax, according to a recall notice posted Saturday by the U.S. Food and Drug Administration.

READ MORE: Kidsburgh: Program In Pittsburgh Pairs Kids With Learning Disabilities With Mentors

“Clinical impact from the foreign material, if present, is expected to be rare, but the remote risk of infection to a patient cannot be ruled out,” Mylan said.

(Source: FDA)

The company did not immediately respond to requests for clarification on the foreign matter.

READ MORE: Aliquippa Football Wins Appeal To Remain In Class 4A

The recall involves Alprazolam Tablets, USP C-IV, 0.5 mg in 500-count bottles, lot No. 8082708, with a September 2020 expiration date. The lot was distributed in July and August.

Consumers who want to return the product can call (888) 843-0255. Consumers with questions about the recall can call Mylan at (800) 796-9526 (Monday through Friday, 8 a.m. to 5 p.m., Eastern time) or by emailing customer.service@mylan.com.

For more information on the recall, visit the FDA’s website at this link.

MORE NEWS: Variety The Children’s Charity Gives Out 5,000th Piece Of Adaptive Equipment

© 2019 CBS Interactive Inc. All Rights Reserved.