Buy Xanax Online No Prescription Xanax, or alprazolam, is a prescription sedative that is often prescribed to treat anxiety disorders and panic disorder. Because it is short-acting — meaning its effects kick in relatively quickly — it comes with a high risk of abuse. Usually prescribed for use as needed, or when anxiety feels overwhelming to the patient, it is not abnormal for those with a legitimate prescription for the drug to take more than is necessary out of fear that a lesser dose will