"Yellow Xanax bars" is a colloquial term used to refer to a specific form of alprazolam, which is a medication belonging to the benzodiazepine class. Alprazolam is commonly prescribed for the treatment of anxiety disorders, panic disorder, and sometimes as a short-term solution for insomnia.

The term "yellow Xanax bars" typically refers to rectangular-shaped tablets that are yellow in color. These tablets are usually scored into four sections and contain a higher dose of alprazolam, typically 2 milligrams (mg).