White Xanax bar contains 2 mg of Alprazolam and is supplied by Pfizer INC. It is indicated for managing various conditions and is the first line of treatment for anxiety, panic attack, and allied disorder. One side of the pill has a "Xanax" Imprint; on the other, "2" is imprinted with four lines for ease of break. The action onset of the drug is twenty-five to thirty minutes, and the effect of the drug lasts for three to four hours. It also works on the same mechanism as other benzodiazepines, which will help tame excessive hyperactivity in the brain and CNS.