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Xanax is useful for treating anxiety and panic disorders. The medication belongs to the benzodiazepines, which acts on the human brain and central nervous system to produce the effects of calmness. Xanax works by activating and enhancing GABA's effects, a natural chemical in the brain, also called gamma-aminobutyric acid. Take Xanax tablets by mouth as recommended by your doctor. Your daily dosage of the medication will be based upon the medical condition you are taking and several other factors such as your general health condition, age, weight, height, etc. People are advised to closely follow the instructions of their doctor to avoid any adverse reaction. However, like all other medicines, Xanax may also cause some side effects, even at recommended doses.