Yellow Xanax Bar is a benzodiazepine medicine. Xanax is a prescription medicine. It is used to treat the symptoms of anxiety, and panic disorder. This also treats anxiety associated with depression. The doctor advises using Yellow Xanax Bar alone or with other medications. Xanax belongs to a class of drugs called Anti-anxiety Agents, Anxiolytics, and Benzodiazepines. It lasts from 31 hours to 134.