Blue Xanax Bars B707 have a strength of 2mg and contain 2mg of Alprazolam and additional inactive ingredients. It is a benzodiazepine used to treat anxiety and other disorders. It raises the level of GABA activity in the brain, reducing hyperactivity. As a result, it attaches in the same place as naturally occurring GABA. As a result, it alleviates symptoms and has a calming effect on the body.