Xanax Bars Xanax is a trading name of Alprazolam that is a short-acting benzodiazepine. These bars are used to management of anxiety disorder, especially for the panic disorder. You may also use it for the treatment of alcohol withdrawal symptoms. This medication may be used with other treatment on the instruction of your doctor. Dosage and forms of Xanax When your doctor prescribed this medication, he also tells you how much to consume it per day. And it is crucial to take a proper dose as instructed by your doctor. Here, we have mentioned some standard dosage for this medication.