TAMPA (WFLA/CNN) – Mylan Pharmaceuticals is recalling a single lot of anti-anxiety medication, commonly sold as Xanax.

Xanax is the brand name for the anti-anxiety medication Alprazolam.

The company believes the recalled product could potentially contain a foreign substance, causing a risk of illness.

The voluntary recall includes bottles containing 500 half milligram tablets.

The lot number is 8082708 and the expiration date is Sept/ 2020.

Mylan says the pills were disturbed in the U.S. between July and August.