This brings us to the well-known anti-anxiety medicine, Xanax. The brand name Xanax refers to alprazolam, a benzodiazepine medication used to treat depression and anxiety disorders. It is also used to temporarily alleviate anxiety symptoms. Xanax provides calming effects and helps regulate excessive brain activity. Xanax tablets are typically used orally, with or without food. You should only take them as directed by your doctor because taking them in excess can have dangerous negative effects. Here are some essential facts you should be aware of if you have been prescribed Xanax (alprazolam), including what it is, how it works, where to purchase it, and how it treats anxiety.