Overview — Alprazolam, commonly known by the brand name Xanax, is a short-acting central nervous system depressant in the benzodiazepine family. It enhances the effect of the inhibitory neurotransmitter GABA at GABAA receptors, producing anxiolytic, sedative and muscle-relaxant effects. Alprazolam is available by prescription and is regulated as a controlled substance in many countries.

Clinical uses

Alprazolam is most often prescribed for acute management of anxiety, including generalized anxiety disorders, and for the treatment of panic attacks. Clinicians usually favor short courses or intermittent use because of the risk of tolerance and dependence. Formulations include immediate-release tablets, extended-release preparations, and oral solution.

Pharmacology and duration

As a short-acting agent, alprazolam has a relatively rapid onset and a briefer duration of effect than many other benzodiazepines. Those pharmacokinetic properties make it useful for sudden anxiety or panic symptoms but also contribute to rebound anxiety and withdrawal if used regularly and then stopped abruptly.

Adverse effects and dependence

Common adverse effects include drowsiness, dizziness, impaired coordination and cognitive slowing. Because alprazolam can produce tolerance and physical dependence, discontinuation should be gradual under medical supervision. Abrupt cessation after prolonged use can cause withdrawal reactions that range from anxiety and insomnia to, in severe cases, seizures. Misuse and diversion have been reported; alprazolam is frequently cited among widely misused benzodiazepines in the United States, although many prescribed patients do not develop a substance-use disorder.

Interactions and precautions

  • Combining alprazolam with other central nervous system depressants (for example, opioids or alcohol) increases the risk of respiratory depression and sedation.
  • Drugs that strongly inhibit or induce hepatic metabolic enzymes can alter alprazolam levels and effect.
  • Use in older adults, during pregnancy, and in people with respiratory insufficiency requires careful risk–benefit assessment.

History and regulatory status — Developed in the late 20th century, alprazolam became widely prescribed for anxiety and panic disorders. Its clinical value for rapid symptom relief must be balanced against risks of dependence and interactions. Treatment guidelines generally recommend limiting duration, using lowest effective doses, and planning gradual tapering when discontinuing.