White Xanax Bar is an antianxiety medication that helps treat anxiety disorders, panic attacks, and phobias in adults. It belongs to the benzodiazepine group of meedications; thereby, it acts as a CNS depressant that helps to calm the brain and nerve cells. Thus, White Xanax Bars are 2mg of alprazolam pills developed by Pfizer, which are highly recommended drugs in the United States to treat these illnesses.