Yellow Xanax Bars are 2Mg Alprazolam pill, an oral prescription antianxiety medication with the imprint RO39, and Actavis Pharma manufactures it. It is an oral medication used to treat anxiety, seizures, phobias, and panic attacks in the presence or absence of agoraphobia and comorbid depression. Because of its shape and color, it is also known as the “yellow School Bus.” It has three vertical lines that can be divided to produce an equal drug dose. It is a member of the Triazolobenzodiazepine of the Intermediate Propensity drug class. It binds to GABA, aids and accelerates GABA activity, and reduces hyperactivity in the brain. Xanax (Alprazolam) is a benzodiazepine that increases GABA activity while decreasing abnormal brain activity. Due to its habit-forming nature, you should always take it under the supervision of a healthcare professional.