The perso who is in the issues of anxiety he may take blue Xanax bars exactly as directed, effects set in rapidly, normally within 15 minutes to an hour. After taking ir the blood concentration levels of alprazolam peak within two hours. Xanax (Blue , Red Green) is one of seven different versions of alprazolam that is a prescription medication with schedule IV controlled substance. You can get Xanax prescription onlinein different shape.