Buy Xanax online as the best medication for treating anxiety and panic disorders from the medicine group known as benzodiazepines. A group of medicines refers to the category of medicines that works similarly. Xanax is the brand version of Alprazolam; the generic and brand version difference is that the generic form is less costly than the brand version, and dosages may vary from each other. The medicine works by affecting the brain chemicals known as GABA.