Xanax is the brand name for alprazolam, a prescription medication that belongs to a group of medicines called benzodiazepines. Healthcare providers prescribe purchase Xanax online with prescription and it to help treat certain anxiety disorders and panic disorder when it is appropriate for a patient's condition. Because Xanax can cause dependence, misuse, and serious side effects, it is available only by prescription in many countries and should always be taken exactly as directed by a licensed healthcare professional.