Xanax 2 mg is one of the stronger doses of Xanax, that is used to treat as a controlled substance for anxiety disorder. It contains 2 mg of active alprazolam substance of the benzodiazepine drug class. Xanax belongs to the same family that includes diazepam (Valium), clonazepam (Klonopin), lorazepam (Ativan), flurazepam (Dalmane), etc. And it is approved by FDA (Food and Drug Administration) since 1981 as an anxiety treatment medicine.