R666 is imprinted in Red Xanax; it is an FDA-approved prescribed medication. Red Devil Xanax is used to treat anxiety disorders like; phobia, sleeping problems, depression, and panic attacks. Red Xanax bar belongs to a drug class called benzodiazepines. Before buying Red Xanax always check out the real and fake differences. Xanax is available, not Red Xanax also comes with Blue Xanax, Yellow Xanax, Green Xanax, Xanax 1 mg, Xanax 2 mg, Xanax XR 3mg, Xanax 0.5 mg, and Xanax 0.25 mg.