Yellow Xanax bars are 2 mg bars of Alprazolam of high potency and are often used for recreational purposes. Actavis Pharmaceuticals manufacture it, Buy Yellow Xanax Bars which delivers 2mg of Alprazolam. Xanax is a sedative, and it belongs to the class of drug called Benzodiazepines that accelerates the GABA activity. As a result, it induces a calming effect on the brain and mind. The drug's common name or the street name is "Yellow School bus" due to its shape and size. It comes with the imprint "RO39", and one side of the bar is scored.