Xanax is the brand name for alprazolam, a prescription medication belonging to a group of medicines called benzodiazepines. Doctors may prescribe alprazolam for certain anxiety and panic disorders. Because it can cause dependence, sedation, and other serious effects, it is a controlled prescription medicine in the United States and many other countries. “buy Xanax 0.5 mg online with PayPal” may appear in online searches, but consumers should understand that payment methods do not determine whether a medicine is legally or safely supplied.