What kind of medication is Xanax XR 3mg?   Xanax is a trade version of Alprazolam that belongs to the benzodiazepine family of the drugs. Every Xanax tablet contains some amount of Alprazolam as an active ingredient. Likewise, Xanax XR 3mg is also a 3mg amount of Alprazolam that comes for sale as an extended-release tablet. As an Alprazolam, Xanax XR  works by calming...